[Mailman-Users] confirm_delay_cleared = yes vs. Mailman bounce management

[Ralf Hildebrandt]

Today I received a lot of unsubscription notifications for a certain
list.

I grew suspicious and had a closer look. I found that Postfix was
retrying the delivery for a lot of domains behind the same MX and was
(finally) reporting the delivery after a long time of queueing for
that MX host.

This was due to my non-default setting:

confirm_delay_cleared = yes

  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.

The side effect was that these notifications increased the bounce
score, although the delivery was successful.

-- 
Ralf Hildebrandt
Charité - Universitätsmedizin Berlin
Geschäftsbereich IT | Abteilung Netzwerk

Campus Benjamin Franklin (CBF)
Haus I | 1. OG | Raum 105
Hindenburgdamm 30 | D-12203 Berlin

Tel. +49 30 450 570 155
ralf.hildebrandt at charite.de
https://www.charite.de