As far as I understand, this is usually the job of your mail server (I've done it with Exchange and GSuite). You add the domain to your mail server and then cre

As far as I understand, this is usually the job of your mail server (I've done it with Exchange and GSuite). You add the domain to your mail server and then create aliases (or wildcards) in there and add them to your account, and then when you reply you can reply from the alias.