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< li class = "md-nav__item" >
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< a href = "../../../post_installation/firststeps-ip_bindings/" class = "md-nav__link" >
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IP bindings
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../post_installation/firststeps-local_mta/" class = "md-nav__link" >
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Local MTA on Docker host
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../post_installation/firststeps-logging/" class = "md-nav__link" >
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Logging
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../post_installation/firststeps-rp/" class = "md-nav__link" >
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Reverse Proxy
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../post_installation/firststeps-rspamd_ui/" class = "md-nav__link" >
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Rspamd UI
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../post_installation/firststeps-snat/" class = "md-nav__link" >
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SNAT
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../post_installation/firststeps-sync_jobs_migration/" class = "md-nav__link" >
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Sync job migration
< / a >
< / li >
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< / ul >
< / nav >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_5" type = "checkbox" id = "__nav_5" >
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< label class = "md-nav__link" for = "__nav_5" >
Models
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< / label >
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< nav class = "md-nav" aria-label = "Models" data-md-level = "1" >
< label class = "md-nav__title" for = "__nav_5" >
< span class = "md-nav__icon md-icon" > < / span >
Models
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../../models/model-acl/" class = "md-nav__link" >
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ACL
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../models/model-passwd/" class = "md-nav__link" >
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Password hashing
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../models/model-sender_rcv/" class = "md-nav__link" >
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Sender and receiver model
< / a >
< / li >
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< / ul >
< / nav >
< / li >
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_6" type = "checkbox" id = "__nav_6" >
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< label class = "md-nav__link" for = "__nav_6" >
General Troubleshooting
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< / label >
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< nav class = "md-nav" aria-label = "General Troubleshooting" data-md-level = "1" >
< label class = "md-nav__title" for = "__nav_6" >
< span class = "md-nav__icon md-icon" > < / span >
General Troubleshooting
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug/" class = "md-nav__link" >
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Introduction
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-admin_login_sogo/" class = "md-nav__link" >
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Admin login to SOGo
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-rspamd_memory_leaks/" class = "md-nav__link" >
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Advanced: Find memory leaks in Rspamd
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-attach_service/" class = "md-nav__link" >
Attach to a Container
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-common_problems/" class = "md-nav__link" >
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Common Problems
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-logs/" class = "md-nav__link" >
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Logs
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-mysql_upgrade/" class = "md-nav__link" >
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Manual MySQL upgrade
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-mysql_aria/" class = "md-nav__link" >
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Recover crashed Aria storage engine
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-rm_volumes/" class = "md-nav__link" >
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Remove Persistent Data
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-reset_pw/" class = "md-nav__link" >
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Reset Passwords (incl. SQL)
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../troubleshooting/debug-reset_tls/" class = "md-nav__link" >
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Reset TLS certificates
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< / a >
< / li >
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< / ul >
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< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_7" type = "checkbox" id = "__nav_7" >
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< label class = "md-nav__link" for = "__nav_7" >
Backup & Restore
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Backup & Restore" data-md-level = "1" >
< label class = "md-nav__title" for = "__nav_7" >
< span class = "md-nav__icon md-icon" > < / span >
Backup & Restore
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_7_1" type = "checkbox" id = "__nav_7_1" >
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< label class = "md-nav__link" for = "__nav_7_1" >
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Component backup & restore
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< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Component backup & restore" data-md-level = "2" >
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< label class = "md-nav__title" for = "__nav_7_1" >
< span class = "md-nav__icon md-icon" > < / span >
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Component backup & restore
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< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../../backup_restore/b_n_r-backup/" class = "md-nav__link" >
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Backup
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../backup_restore/b_n_r-restore/" class = "md-nav__link" >
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Restore
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../backup_restore/b_n_r-coldstandby/" class = "md-nav__link" >
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Cold-standby (rolling backup)
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< / a >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_7_3" type = "checkbox" id = "__nav_7_3" >
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< label class = "md-nav__link" for = "__nav_7_3" >
Manual backups
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< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Manual backups" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_7_3" >
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< span class = "md-nav__icon md-icon" > < / span >
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Manual backups
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< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../../backup_restore/b_n_r-backup_restore-maildir/" class = "md-nav__link" >
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Maildir
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../../backup_restore/b_n_r-backup_restore-mysql/" class = "md-nav__link" >
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MySQL (mysqldump)
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< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_7_4" type = "checkbox" id = "__nav_7_4" >
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< label class = "md-nav__link" for = "__nav_7_4" >
mailcow-internal backups
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< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "mailcow-internal backups" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_7_4" >
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< span class = "md-nav__icon md-icon" > < / span >
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mailcow-internal backups
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< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../../backup_restore/b_n_r-accidental_deletion/" class = "md-nav__link" >
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Recover accidentally deleted data
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item md-nav__item--active md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_8" type = "checkbox" id = "__nav_8" checked >
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< label class = "md-nav__link" for = "__nav_8" >
Manual/Guides/Examples
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Manual/Guides/Examples" data-md-level = "1" >
< label class = "md-nav__title" for = "__nav_8" >
< span class = "md-nav__icon md-icon" > < / span >
Manual/Guides/Examples
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_8_1" type = "checkbox" id = "__nav_8_1" >
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< label class = "md-nav__link" for = "__nav_8_1" >
mailcow UI
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "mailcow UI" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_8_1" >
< span class = "md-nav__icon md-icon" > < / span >
mailcow UI
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../mailcow-UI/u_e-mailcow_ui-bl_wl/" class = "md-nav__link" >
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Blacklist / Whitelist
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../mailcow-UI/u_e-mailcow_ui-config/" class = "md-nav__link" >
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Configuration
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../mailcow-UI/u_e-mailcow_ui-css/" class = "md-nav__link" >
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CSS overrides
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../mailcow-UI/u_e-mailcow_ui-pushover/" class = "md-nav__link" >
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Pushover
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../mailcow-UI/u_e-mailcow_ui-spamfilter/" class = "md-nav__link" >
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Spamfilter
< / a >
< / li >
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2021-04-01 12:20:45 +02:00
< li class = "md-nav__item" >
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< a href = "../../mailcow-UI/u_e-mailcow_ui-tagging/" class = "md-nav__link" >
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Tagging
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../mailcow-UI/u_e-mailcow_ui-spamalias/" class = "md-nav__link" >
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Temporary email aliases
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../mailcow-UI/u_e-mailcow_ui-tfa/" class = "md-nav__link" >
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Two-Factor Authentication
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../mailcow-UI/u_e-mailcow_ui-fido/" class = "md-nav__link" >
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WebAuthn / FIDO2
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item md-nav__item--active md-nav__item--nested" >
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< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_8_2" type = "checkbox" id = "__nav_8_2" checked >
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< label class = "md-nav__link" for = "__nav_8_2" >
Postfix
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Postfix" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_8_2" >
< span class = "md-nav__icon md-icon" > < / span >
Postfix
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../u_e-postfix-trust_networks/" class = "md-nav__link" >
Add trusted networks
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../u_e-postfix-custom_transport/" class = "md-nav__link" >
Custom transport maps
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< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../u_e-postfix-extra_cf/" class = "md-nav__link" >
Customize/Expand main.cf
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../u_e-postfix-disable_sender_verification/" class = "md-nav__link" >
Disable Sender Addresses Verification
< / a >
< / li >
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< li class = "md-nav__item" >
< a href = "../u_e-postfix-attachment_size/" class = "md-nav__link" >
Max. message size (attachment size)
< / a >
< / li >
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< li class = "md-nav__item md-nav__item--active" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "toc" type = "checkbox" id = "__toc" >
< label class = "md-nav__link md-nav__link--active" for = "__toc" >
Relayhosts
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< a href = "./" class = "md-nav__link md-nav__link--active" >
Relayhosts
< / a >
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< nav class = "md-nav md-nav--secondary" aria-label = "Table of contents" >
< label class = "md-nav__title" for = "__toc" >
< span class = "md-nav__icon md-icon" > < / span >
Table of contents
< / label >
< ul class = "md-nav__list" data-md-component = "toc" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "#add-a-new-relayhost" class = "md-nav__link" >
Add a new relayhost
< / a >
< nav class = "md-nav" aria-label = "Add a new relayhost" >
< ul class = "md-nav__list" >
< li class = "md-nav__item" >
< a href = "#test-a-relayhost" class = "md-nav__link" >
Test a relayhost
< / a >
< / li >
< / ul >
< / nav >
< / li >
< li class = "md-nav__item" >
< a href = "#set-the-relayhost-for-a-domain" class = "md-nav__link" >
Set the relayhost for a domain
< / a >
< / li >
< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
< a href = "../u_e-postfix-pflogsumm/" class = "md-nav__link" >
Statistics with pflogsumm
< / a >
< / li >
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2021-09-08 11:41:26 +02:00
< li class = "md-nav__item" >
< a href = "../u_e-postfix-postscreen_whitelist/" class = "md-nav__link" >
Whitelist IP in Postscreen
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_8_3" type = "checkbox" id = "__nav_8_3" >
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< label class = "md-nav__link" for = "__nav_8_3" >
Unbound
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Unbound" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_8_3" >
< span class = "md-nav__icon md-icon" > < / span >
Unbound
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../Unbound/u_e-unbound-fwd/" class = "md-nav__link" >
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Using an external DNS service
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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2021-04-01 12:20:45 +02:00
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_8_4" type = "checkbox" id = "__nav_8_4" >
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< label class = "md-nav__link" for = "__nav_8_4" >
Dovecot
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Dovecot" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_8_4" >
< span class = "md-nav__icon md-icon" > < / span >
Dovecot
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-extra_conf/" class = "md-nav__link" >
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Customize/Expand dovecot.conf
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-any_acl/" class = "md-nav__link" >
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Enable "any" ACL settings
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-expunge/" class = "md-nav__link" >
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Expunge a Users mails
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< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-fts/" class = "md-nav__link" >
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FTS (Solr)
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-idle_interval/" class = "md-nav__link" >
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IMAP IDLE interval
< / a >
< / li >
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2021-04-01 12:20:45 +02:00
< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-mail-crypt/" class = "md-nav__link" >
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Mail crypt
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-more/" class = "md-nav__link" >
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More Examples with DOVEADM
< / a >
< / li >
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2021-09-23 20:30:54 +02:00
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< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-vmail-volume/" class = "md-nav__link" >
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Move Maildir (vmail)
< / a >
< / li >
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2021-09-23 20:30:54 +02:00
2021-04-01 12:20:45 +02:00
< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-public_folder/" class = "md-nav__link" >
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Public folders
< / a >
< / li >
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2021-09-23 20:30:54 +02:00
2021-04-01 12:20:45 +02:00
< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-static_master/" class = "md-nav__link" >
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Static master user
< / a >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../Dovecot/u_e-dovecot-catchall_vacation/" class = "md-nav__link" >
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Vacation replies for catchall addresses
< / a >
< / li >
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< / ul >
< / nav >
< / li >
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2021-09-23 20:30:54 +02:00
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< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_8_5" type = "checkbox" id = "__nav_8_5" >
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< label class = "md-nav__link" for = "__nav_8_5" >
Nginx
< span class = "md-nav__icon md-icon" > < / span >
< / label >
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< nav class = "md-nav" aria-label = "Nginx" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_8_5" >
< span class = "md-nav__icon md-icon" > < / span >
Nginx
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
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< li class = "md-nav__item" >
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< a href = "../../Nginx/u_e-nginx_webmail-site/" class = "md-nav__link" >
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Create subdomain webmail.example.org
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< / a >
< / li >
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2021-04-01 12:20:45 +02:00
< li class = "md-nav__item" >
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< a href = "../../Nginx/u_e-nginx_custom/" class = "md-nav__link" >
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Custom sites
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< / a >
< / li >
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2021-04-01 12:20:45 +02:00
< / ul >
< / nav >
< / li >
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2021-10-29 12:30:34 +02:00
< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_8_6" type = "checkbox" id = "__nav_8_6" >
< label class = "md-nav__link" for = "__nav_8_6" >
Watchdog
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "Watchdog" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_8_6" >
< span class = "md-nav__icon md-icon" > < / span >
Watchdog
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
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< a href = "../../Watchdog/u_e-watchdog-thresholds/" class = "md-nav__link" >
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Thresholds
< / a >
< / li >
< / ul >
< / nav >
< / li >
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< li class = "md-nav__item" >
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< a href = "../../Redis/u_e-redis/" class = "md-nav__link" >
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Redis
< / a >
< / li >
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2021-09-23 20:30:54 +02:00
2021-04-01 12:20:45 +02:00
< li class = "md-nav__item" >
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< a href = "../../Rspamd/u_e-rspamd/" class = "md-nav__link" >
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Rspamd
< / a >
< / li >
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2021-09-23 20:30:54 +02:00
2021-04-01 12:20:45 +02:00
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< li class = "md-nav__item md-nav__item--nested" >
< input class = "md-nav__toggle md-toggle" data-md-toggle = "__nav_8_9" type = "checkbox" id = "__nav_8_9" >
< label class = "md-nav__link" for = "__nav_8_9" >
ClamAV
< span class = "md-nav__icon md-icon" > < / span >
< / label >
< nav class = "md-nav" aria-label = "ClamAV" data-md-level = "2" >
< label class = "md-nav__title" for = "__nav_8_9" >
< span class = "md-nav__icon md-icon" > < / span >
ClamAV
< / label >
< ul class = "md-nav__list" data-md-scrollfix >
< li class = "md-nav__item" >
< a href = "../../ClamAV/u_e-clamav-whitelist/" class = "md-nav__link" >
Whitelist
< / a >
< / li >
< li class = "md-nav__item" >
< a href = "../../ClamAV/u_e-clamav-additional_dbs/" class = "md-nav__link" >
Additional Databases
< / a >
< / li >
< / ul >
< / nav >
< / li >
2021-04-01 12:20:45 +02:00
< li class = "md-nav__item" >
2022-02-04 14:27:16 +01:00
< a href = "../../SOGo/u_e-sogo/" class = "md-nav__link" >
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SOGo
< / a >
< / li >
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2021-04-01 12:20:45 +02:00
2021-09-23 20:30:54 +02:00
2021-04-01 12:20:45 +02:00
< li class = "md-nav__item md-nav__item--nested" >
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< svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" > < path d = "M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75L3 17.25z" / > < / svg >
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< h1 > Relayhosts< / h1 >
< p > As of September 12, 2018 you can setup relayhosts as admin by using the mailcow UI.< / p >
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< p > This is useful if you want to relay outgoing emails for a specific domain to a third-party spam filter or a service like Mailgun or Sendgrid. This is also known as a < em > smarthost< / em > .< / p >
< h2 id = "add-a-new-relayhost" > Add a new relayhost< a class = "headerlink" href = "#add-a-new-relayhost" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Go to the < code > Routing< / code > tab of the < code > Configuration and Details< / code > section of the admin UI.
Here you will see a list of relayhosts currently setup.< / p >
< p > Scroll to the < code > Add sender-dependent transport< / code > section.< / p >
< p > Under < code > Host< / code > , add the host you want to relay to. < br >
< em > Example: if you want to use Mailgun to send emails instead of your server IP, enter smtp.mailgun.org< / em > < / p >
< p > If the relay host requires a username and password to authenticate, enter them in the respective fields. < br >
Keep in mind the credentials will be stored in plain text.< / p >
< h3 id = "test-a-relayhost" > Test a relayhost< a class = "headerlink" href = "#test-a-relayhost" title = "Permanent link" > ¶ < / a > < / h3 >
< p > To test that connectivity to the host works, click on < code > Test< / code > from the list of relayhosts and enter a < em > From:< / em > address. Then, run the test.< / p >
< p > You will then see the results of the SMTP transmission. If all went well, you should see
< code > SERVER -> CLIENT: 250 2.0.0 Ok: queued as A093B401D4< / code > as one of the last lines.< / p >
< p > If not, review the error provided and resolve it.< / p >
< p > < strong > Note:< / strong > Some hosts, especially those who do not require authentication, will deny connections from servers that have not been added to their system beforehand. Make sure you read the documentation of the relayhost to make sure you've added your domain and/or the server IP to their system.< / p >
< p > < strong > Tip:< / strong > You can change the default test < em > To:< / em > address the test uses from < em > null@mailcow.email< / em > to any email address you choose by modifying the < em > $RELAY_TO< / em > variable on the < em > vars.inc.php< / em > file under < em > /opt/mailcow-dockerized/data/web/inc< / em > < br > This way you can check that the relay worked by checking the destination mailbox.< / p >
< h2 id = "set-the-relayhost-for-a-domain" > Set the relayhost for a domain< a class = "headerlink" href = "#set-the-relayhost-for-a-domain" title = "Permanent link" > ¶ < / a > < / h2 >
< p > Go to the < code > Domains< / code > tab of the < code > Mail setup< / code > section of the admin UI.< / p >
< p > Edit the desired domain.< / p >
< p > Select the newly added host on the < code > Sender-dependent transports< / code > dropdown and save changes.< / p >
< p > Send an email from a mailbox on that domain and you should see postfix handing the message over to the relayhost in the logs.< / p >
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