I'm not sure if I understand the process of setting up alias domain right, so I'd like to verify it here. I have my mail server configured as mail.domain.com for addresses like username@domain.com and I want to add alias.com as an alias domain so users could use username@alias.com. Should I: In DNS admin panel: 1. Set up DNS records for alias.com & mail.alias.com like with normal mail subdomain (A, MX, CNAME, DMARC etc.) In Mailcow: 2. Add alias.com on Domains tab. 3. Add DKIM keys on Configuration tab. 4. Add domain alias alias.com -> domain.com on Domain aliases tab. Is it good procedure?

Setting up alias domain

killgore

I’m not sure if I understand the process of setting up alias domain right, so I’d like to verify it here.
I have my mail server configured as mail.domain.com for addresses like username@domain.com and I want to add alias.com as an alias domain so users could use username@alias.com.

Should I:
In DNS admin panel:

Set up DNS records for alias.com & mail.alias.com like with normal mail subdomain (A, MX, CNAME, DMARC etc.)

In Mailcow:

Add alias.com on Domains tab.
Add DKIM keys on Configuration tab.
Add domain alias alias.com -> domain.com on Domain aliases tab.

Is it good procedure?

diekuh

Do the mailcow steps first.

Add the DKIM in alias.com you just created in mailcow. You should set the MX to MAILCOW_HOSTNAME in alias.com, no matter wether you want to receive mails for it. Some mail servers punish you for not setting up an MX, they check for that.

If you send from alias.com (as you wrote), you can copy the SPF and DMARC stuff from domain.com to alias.com

killgore

diekuh
Thank you for quick answer.
As I understand you are saying, that I don’t need mail.alias.com subdomain. I can just point MX for alias.com to mail.domain.com.