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# Tagging

Mailbox users can tag their mail address like in `me+facebook@example.org`. They can control the tag handling in the users mailcow UI panel.

Tagging is also known as 'sub-addressing' (RFC 5233) or 'plus addressing'

### Available Actions

1. Move this message to a sub folder "facebook" (will be created lower case if not existing)

2. Prepend the tag to the subject: "[facebook] Subject"

Please note: Uppercase tags are converted to lowercase except for the first letter. If you want to keep the tag as it is, please apply the following diff and restart mailcow:

    diff --git a/data/conf/dovecot/global_sieve_after b/data/conf/dovecot/global_sieve_after
    index e047136e..933c4137 100644
    --- a/data/conf/dovecot/global_sieve_after
    +++ b/data/conf/dovecot/global_sieve_after
    @@ -15,7 +15,7 @@ if allof (
       envelope :detail :matches "to" "*",
       header :contains "X-Moo-Tag" "YES"
       ) {
    -  set :lower :upperfirst "tag" "${1}";
    +  set "tag" "${1}";
       if mailboxexists "INBOX/${1}" {
         fileinto "INBOX/${1}";
       } else {

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