Question about Postfix domain and host names.

[apinto]

Greetings,
Currently my email setup is working fine (using SSL and Amavis as extras).

However all my internal email are from account@ctrl.vanguardly.com (for example postmaster@ctrl.vanguardly.com).
I would like to change it to just @vanguardly.com.

However the DNS of vanguardly.com does NOT point to the same IP as ctrl.vanguardly.com (CloudFlare)

To do that I believe I need to change mydomain on the postfix/main.cf to vanguardly.com.
Below there is my current main.cf setup:

Code:

mydomain = ctrl.vanguardly.com
myhostname = ctrl.vanguardly.com

The server hostname is indeed ctrl.vanguardly.com.

My question is, can I change mydomain to vanguardly.com without issues?
Also if there is a better way of achieving this, I would appreciate

[Me.B]

It should resolve. It's better you think about it as the server reverse not your main domain.

M B

[apinto]

What you mean with server reverse?
That mydomain should match reverse dns ip?