New Email Domain without Incoming Server

Hello there, I want to setup a new email domain, but at the moment I only have server info for sending emails and I’m not interested in receiving any emails. Is there a way to setup the email domain only for sending emails?

I usually just use imap.gmail.com to get past this - you don’t have to provide credentials. Use Port: 993 and SSL

This will fail when saving the email account where imap credential does not work even when incoming is not enabled.

Is anyone else facing this issue?