how to treat synonymous domain names as one

Hallo List Users,

I am curious if there is a way to rewrite domain name to another domain name. My goal is to provide authentication and mailboxes for the synonymous domains in a single source while keeping all other domains separate.

I have setup:

auth_username_format = %Lu
mail_location = /var/vmail/%d/%u/Maildir

in userdb/passdb (passwd-file):
/etc/dovecot/%d/users

Say I have two synonymous domain names

my-domain-1.com my-long-named-domain-1.com

I want both to resolve to my-domain-1.com when %d variable is used in Dovecot configs, so that

passwd-file is /etc/dovecot/my-domain-1.com/users mailbox is /var/vmail/my-domain-1.com/user/Maildir

while keeping other domains unchanged

my-other-domain-2.com

should resolve to:

passwd-file is /etc/dovecot/my-other-domain-2.com/users mailbox is /var/vmail/my-other-domain-2.com/user/Maildir

thanks, Nikolai