Asai:
> Greetings,
>
> Our organization is deploying a new upgraded Postfix server and we're
> looking for various options to migrate users from the old to the new.?
> One possibility, we hope, is to do it on a per user basis rather than
> doing it all at once for a whole domain (which is also viable, but seems
> to result in more downtime for users until IT staff can make their
> rounds to their computers).? I have done some reading of documentation,
> but I'm not clear on whether using relay_recipient_maps is an option, or
> perhaps the transport_maps directive.
>
> So, is this possible in Postfix, to relay email from the old to the new
> Postfix server on a per user basis, if so, what are some good options?
The following uses two transport maps and no changes in
relay_recipient_maps:
Assuming that both machines will accept mail for every
user@the-domain-in-question:
- One transport map on the new machine, that sends mail for
non-migrated user@the-domain-in-question to the old machine.
- One transport map on the old machine, that sends mail for migrated
user@the-domain-in-question to the new machine.
To migrate a user, delete her from the transport map on the new
machine before adding her to the transport map on the old machine,
otherwise mail will loop.
Wietse
