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External Preparation

DNS records​

You are configuring this mail server to enjoy sending and receiving emails at your domain addresses (e.g. your_name@yourdomain.tld) so you must be the owner of yourdomain.tld and have access to its DNS zone, this is generally provided by the domain name seller.

Mandatory Records​

Each domain that you want to add to this mailcow server needs at least this set of records to function correctly:

$ORIGIN yourdomain.tld.
(...)
yourmail.yourdomain.tld.    3600 IN A        ipaddress(v4)
yourmail.yourdomain.tld.    3600 IN AAAA     ipaddress(v6)
autodiscover                3600 IN CNAME    yourmail.yourdomain.tld.
autoconfig                  3600 IN CNAME    yourmail.yourdomain.tld.
@                           3600 IN MX 10    yourmail.yourdomain.tld.
(...)

Advanced Records​

SRV records specify the server(s) for a specific protocol on your domain:

$ORIGIN yourdomain.tld.
(...)
_autodiscover._tcp   3600 IN SRV 0 1    443    yourmail.yourdomain.tld.
_caldavs._tcp        3600 IN SRV 0 1    443    yourmail.yourdomain.tld.
_caldavs._tcp        3600 IN TXT "path=/SOGo/dav/"
_carddavs._tcp       3600 IN SRV 0 1    443    yourmail.yourdomain.tld.
_carddavs._tcp       3600 IN TXT "path=/SOGo/dav/"
_imap._tcp           3600 IN SRV 0 1    143    yourmail.yourdomain.tld.
_imaps._tcp          3600 IN SRV 0 1    993    yourmail.yourdomain.tld.
_pop3._tcp           3600 IN SRV 0 1    110    yourmail.yourdomain.tld.
_pop3s._tcp          3600 IN SRV 0 1    995    yourmail.yourdomain.tld.
_sieve._tcp          3600 IN SRV 0 1    4190   yourmail.yourdomain.tld.
_smtps._tcp          3600 IN SRV 0 1    465    yourmail.yourdomain.tld.
_submission._tcp     3600 IN SRV 0 1    587    yourmail.yourdomain.tld.
(...)

Additional Records:​

After installation of mailcow is finished, you will come back to your DNS zone to set some final records to ensure that your server accrues good reputation in the Internet, you will need to add SPF, DKIM and DMARC information.

Reverse DNS​

Make sure that the PTR record of your IP address matches the FQDN of your mailcow host, for example: yourmail.yourdomain.tld.