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docs/dns.md
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docs/dns.md
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Below you can find a list of **recommended DNS records**. While some are mandatory for a mail server (A, MX), others are recommended to build a good reputation score (TXT/SPF) or used for auto-configuration of mail clients (SRV).
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## References
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* A good article covering all relevant topics:
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- A good article covering all relevant topics:
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["3 DNS Records Every Email Marketer Must Know"](https://www.rackaid.com/blog/email-dns-records)
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* Another great one, but Zimbra as an example platform:
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- Another great one, but Zimbra as an example platform:
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["Best Practices on Email Protection: SPF, DKIM and DMARC"](https://wiki.zimbra.com/wiki/Best_Practices_on_Email_Protection:_SPF,_DKIM_and_DMARC)
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* An in-depth discussion of SPF, DKIM and DMARC:
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- An in-depth discussion of SPF, DKIM and DMARC:
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["How to eliminate spam and protect your name with DMARC"](https://www.skelleton.net/2015/03/21/how-to-eliminate-spam-and-protect-your-name-with-dmarc/)
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## Reverse DNS of your IP
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## The minimal DNS configuration
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This example shows you a set of records for one domain. Each domain that is added to mailcow needs at least this set or records.
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This example shows you a set of records for one domain managed by mailcow. Each domain that is added to mailcow needs at least this set or records to function correctly.
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```
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# Name Type Value
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mail IN A 1.2.3.4
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autodiscover IN A 1.2.3.4
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autoconfig IN A 1.2.3.4
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_autodiscover._tcp IN SRV 0 1 443 autodiscover.example.org.
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```
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## Testing
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Here are some tools you can use to verify your DNS configuration:
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- [MX Toolbox](https://mxtoolbox.com/SuperTool.aspx) (DNS, SMTP, RBL)
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- [port25.com](https://www.port25.com/dkim-wizard/) (DKIM, SPF)
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- [HAD Pilot](https://www.had-pilot.com/testdetails.html) (DKIM, DMARC, SPF)
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@ -5,7 +5,7 @@ Before you run **mailcow: dockerized**, there are a few requirements that you sh
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Fore more details read: [github.com/docker/docker/issues/30402](https://github.com/docker/docker/issues/30402) and [forum.mailcow.email/t/solved-mailcow-docker-causes-kernel-panic-edit/448](https://forum.mailcow.email/t/solved-mailcow-docker-causes-kernel-panic-edit/448)
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- Mailcow: dockerized requires [some ports](#default-ports) to be open for incomming connections, so make sure that your firewall is not bloking these. Also make sure that no other application is interferring with mailcow's configuration.
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- A correct DNS setup is crucial to every good mailserver setup, so please make sure you got at least the [basics](dns/#the-minimal-dns-configuration) covered bevore you begin!
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- Make sure that your system has a correct date and time setup. This is crucial for stuff like two factor TOTP authentication.
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- Make sure that your system has a correct date and [time setup](#date-and-time). This is crucial for stuff like two factor TOTP authentication.
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## Minimum System Resources
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| Dovecot ManageSieve | TCP | 4190 | dovecot-mailcow | `${SIEVE_PORT}` |
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| HTTP(S) | TCP | 80/443 | nginx-mailcow | `${HTTP_PORT}`/`${HTTPS_PORT}` |
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## Enabling NTP services
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## Date and Time
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To ensure that you have the correct date and time setup on your system, please check the output of `timedatectl status`:
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```bash
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```
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$ timedatectl status
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Local time: Sat 2017-05-06 02:12:33 CEST
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Universal time: Sat 2017-05-06 00:12:33 UTC
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