You're lucky Brian A:
Another example, we have mail stuck in spool because one of the local recipient's mailbox is full... but the error is ambigous.
Error: FailedAllAttempts, if i check the target mailbox (local), it is full but the error message is wrong.
Also it seems it's blocking the other recipients (remote deliveries) which stays on pending...
And the spool is LOOPING hard, more than once on this delivery attempts, every second:
And If I check one of the delivery attempt session:
[2024.08.14] 13:49:31.474 [27231848] Exception: Object reference not set to an instance of an object.
[2024.08.14] 13:49:31.474 [27231848] Local delivery message bounced; too many tries
[2024.08.14] 13:49:31.474 [27231848] Removed from LocalDeliveryQueue (5 queued or processing)
[2024.08.14] 13:49:34.473 [27231848] Added to LocalDeliveryQueue (0 queued; 8/150 processing)
[2024.08.14] 13:49:34.473 [27231848] [LocalDeliveryQueue] Begin Processing.
[2024.08.14] 13:49:34.479 [27231848] Exception: Object reference not set to an instance of an object.
[2024.08.14] 13:49:34.479 [27231848] Local delivery message bounced; too many tries
[2024.08.14] 13:49:34.479 [27231848] Removed from LocalDeliveryQueue (4 queued or processing)
[2024.08.14] 13:49:37.500 [27231848] Added to LocalDeliveryQueue (0 queued; 12/150 processing)
[2024.08.14] 13:49:37.500 [27231848] [LocalDeliveryQueue] Begin Processing.
[2024.08.14] 13:49:37.505 [27231848] Exception: Object reference not set to an instance of an object.
[2024.08.14] 13:49:37.505 [27231848] Local delivery message bounced; too many tries
[2024.08.14] 13:49:37.505 [27231848] Removed from LocalDeliveryQueue (9 queued or processing)
[2024.08.14] 13:49:40.508 [27231848] Added to LocalDeliveryQueue (0 queued; 9/150 processing)
I'm almost sure it's because the target mailbox is full... but this seems wrongly handled.
We also have other delivery issues where the error is "Error: 0", again with excpetion in the delivery logs.