A frontend postfix install I've in place is being subject to a literal tear-down+relocate of its various backends (relays to other postfix & imap instances).
The building's being torn down, and the occupant's relocating. Not the best
managed process, but oh well.
It's a one-time event; not something I want/need to replicate in the future.
The frontend itself will stay up, and in-service; it's on an offsite VM.
For that^ period, I'd like to 'simply' redirect any/all mail received by the
frontend to a few mail addresses hosted at a mail provider.
Specifically,
if TO: us...@example1.com, redirect-to: otherus...@backup.com
if TO: us...@example2.com, redirect-to: otherus...@backup.com
if TO: *@example*.com, redirect-to: catchallu...@backup.com
, ideally 'touching' as little as possible of my existing config; the goal
being to make minor change, then reverse it soon-enough. I don't want the
bother of spinning up a separate set of backends for this event.
I suspect a map is appropriate (transport?), likely added to master.cf ...
The operating goal is to make all received email accessible/retrievable for the
'down' period.
It doesn't have to be 'pretty', but I would like to avoid shooting myself in
the foot.
Advice/recommendations as to how best to do this -- or what to avoid! -- would
be appreciated.
