> As some of the EMail recipients I relay for infrequently dial-up,
> their mail can be held in the queue for some time (especially over
> holidays etc). I think it's important that the sender knows that the
> mail has not been received so I set a fairly low value on
> delay_warning.
I, on the other hand, don't ever want mail addressed to me to result in
delay notifications being sent out. This should really be adjustable
per-destination.
[idea for new configuration variables]
> (1) delay_warning_initial t1
> (2) delay_warning_max t2
> (3) delay_warning_increment t3
> (4) delay_warning_total t4
Hmm. I wonder if some extra syntax could be added to the retry rules
to say when to send delay warnings?
example.org * F,4h,5m; N; G,16h,30m,1.5; N; FN3,10d,8h
When mail to example.org encounters a temporary failure, retry every 5
minutes for 4 hours; then send a delay notification; then retry with
exponentially increasing delays, starting from a 30 minute delay and
increasing the delay by a factor of 1.5 every time, until a total of 16
hours has elapsed from when the message arrived; then send another delay
notification; then retry every 8 hours until a total of 10 days has
elapsed since the message arrived, and send a delay notification after
every third such retry attempt; finally, after the 10 days has elapsed,
bounce the message.
--apb (Alan Barrett)
