Wietse Venema:
> Florian Pritz:
> > Hi,
> >
> > I've currently set delay_warning_time = 4h and maximal_queue_lifetime =
> > 5d, which are nice values and all, but if I get a delay DSN I'd like to
> > know sooner than after 5 days if the mail went through.
> >
> > I can't seem to find an option that sends me a positive DSN for delayed
> > mail, is there one? If not, is this something you'd consider implementing?
>
> I think that this can be implemented without a significant amount
> of code. Thus, it is likely to work correctly.
This turned out to be easier than expected. Manpage fragment for
Postfix 2.12-20140907:
confirm_delay_cleared (default: no)
After sending a "your message is delayed" notification,
inform the sender when the delay clears up. This can result
in a sudden burst of notifications at the end of a prolonged
network outage, and is therefore disabled by default.
Adding this required only minor extension of existing infrastructure.
The feature is also available as a patch for older Postfix versions at
ftp://ftp.porcupine.org/mirrors/postfix-release/experimental/feature-patches/20140907-confirm_delay_cleared-patch
Wietse
