Howto: Configure Public DNS Entries for Mail Server


Configure public DNS entries for mail server

Step 1

Configure an “A record” to be used for you server.
mail.multi.ucs A <>

Step 2

Configure a “PTR Record” for reverse resolution. PTR mail.multi.ucs

Step 3

Configure the MX Record. Use an A record! Do not use an IP address or a CNAME entry.
multi.ucs MX 10 mail.multi.ucs

Step 4

Configure Postfix to use the public domain name and accept Emails.

root@mail:~# ucr set mail/smtp/helo/name=mail.multi.ucs
root@mail:~# systemctl restart postfix

Step 5

Make sure your firewall accepts and forwards the needed ports.