Email DNS Configuration

June 3, 2019 331 views
Email DNS Ubuntu 18.04


I try to make an custom email with a domain name and postfix on my own server. I looked some tutorials but i don’t understand how it works. I know how to point a domain or subdomain to a server but i don’t understand the logic of DNS mail config. So how to configure correctly the DNS Domain with MX, IMAP, POP3 etc… What must to link to the IP address ? I already installed the webmail rainloop with subdomain on it.

1 Answer


I hope you’ve managed to configure this.

MX record - this needs to be pointed to the IP address of your server
You can create two CNAME records:

and point them to the IP of the server as well. You will need to chose one of those to use. Usually IMAP is used due to the fact you can access your email account from multiple devices.

You need to check the postfix configuration on your server and see the ports of IMAP/POP3 and SMTP in order to configure your mail client.

IMAP ports:
Secure (SSL) 993
Non-Encrypted 143

POP3 ports:
Secure (SSL) 995
Non-Encrypted 110

SMTP ports:
Secure (SSL) 465
Non-Encrypted 25


Have another answer? Share your knowledge.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!