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.
First, when the queue manager selects a message for delivery, it
needs to find out that a "delayed" DSN was sent for that message.
That is easy. Each Postfix queue file either contains no delay
warning record, or it contains a delay warning record with a time
value that says when to send a "delayed" warning. A zero time value
means that the "delayed" warning was already sent.
Once the queue manager sees that the "delayed" DSN was already sent,
it sets a new NOTIFY flag for all subsequent delivery attempts.
That new flag is almost like the standard NOTIFY=SUCCESS flag,
except that this flag is not sent to a remote SMTP server. Instead,
the Postfix SMTP client reports a "relayed" status. Other Postfix
delivery agents will treat this new flag as the standard NOTIFY=SUCCESS
flag, and report a "delivered" status.
Wietse
