PGNet Dev:
> my usual postfix front-end workflow is
>
> postscreen
> if 'fail', reject
> if 'pass', then
> internal smtp
> etc
>
> i'd like to implement a 'maintenance/offline mode' -- WITH smtp response --
> effectively adding
>
> postscreen
> if 'fail', reject
> if 'pass', then
> + if 'maintenance mode' = ON, then
> + reply SMTP 4XX, msg = (user specified message,
> e.g. down 4 maintenance, try again in X hours)
> + else if 'maintenance mode' = OFF, then
> internal smtp
> etc
>
> there are many paths to that particular mountain.
>
> is there an already built-in maintenance-mode, or somesuch, in postfix?
> it'd be most convenient; if it's in docs, i've missed it.
Just let it pass to real smtpd, then reject there.
smtpd_client_restrictions =
check_client_access static:{421 Service down for maintenance}
# Use if you don't care what mail you aren't receiving.
smtpd_relay_reject = no
With 421, Postfix will hang up.
Wietse
