Solved One mailbox gives "Internal error occurred. Refer to server log for more information"

[CrazyFrog]

Hi fellow DA wizards (well.. I'm not a wizard..)

I'm having a strange problem with only one mailbox. I can't mail to it. When I grep /var/log/exim/mainlog I see that this user has the same problem multiple times. I find the following error in the mainlog multiple times:

2023-11-29 00:15:18 1r7a8Y-00D94h-2H == [email protected] R=virtual_user T=dovecot_lmtp_udp defer (-46): LMTP error after end of data: 451 4.2.0 <[email protected]> Internal error occurred. Refer to server log for more information. [2023-11-29 00:15:18]

(Anonymized the customer's domain)

I don't find the error on any other mailboxes. The customer is not out of disk quota, and the mailbox has no limit. Any tips on where I can look?

Thanks!!
CF

 

[kristian]

Did you look in the dovecot log? Should be in /var/log/dovecot<something>.

 

[CrazyFrog]

Thanks! I've looked there and found the problem! It was my AppArmor rules that prevented Dovecot from autocreating the mailbox. The big question is, why did the mailbox need to be autocreated while it was in use for 10 years, maybe the user emptied it... At least it's receiving mails again now!

Thanks!
CF