Can IMAP/SMTP domain be different from sender domain?

Since I’ll have to upgrade mailinabox to a new Ubuntu 22.04 server, I want to make some changes. Domains and will be moved to the server with a new IP address on that box.

I have multiple sender domains (, and IMAP/SMTP are pointing to It doesn’t make sense to users. I want to fix this.

So I am thinking I should create to be the IMAP/SMTP domain and and users will connect to as the mail server.

Is it possible within mailinabox configuration? Thanks.


You can use any valid hostname for any domain that you control.
(Within reason, www would be a bad choice for example).

What you are referring to as the “IMAP/SMTP domain” is actually the mail server “hostname”.

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