On 10/17/19 2:48 AM, Ralf Hildebrandt wrote:
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.
Apparently these notifications were recognized by Mailman as fatal bounces. If you can provide an example of the notification, we can adjust the bounce recognizer to ignore them.