Multiple Domains

[Doug Hardie]

I have Dovecot 2.2.19 running.  However, one client has a rather unusual need.  There are multiple domains that currently access their mail on the server.  However, this on domain/client wants to use a different port for their users to access mail.  Anyone on the standard port trying to download mail would receive an invalid user error (or whatever the proper error for that is).  Likewise, only this clients users could access their mail on the new port.  Is this possible?

— Doug