17 Oct
2019
17 Oct
'19
5:48 a.m.
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.
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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@charite.de
https://www.charite.de