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Kerio Connect Mailbox alias could not be expanded


Some material is very old and may be incorrect today

© December 2015 Anthony Lawrence

2015/01/13

A customer complained that a user suddenly could not recieve mail. Anything sent would be returned with "550 5.3.0 Mailbox alias could not be expanded". I don't have access to their server, so I asked the obvious: is the name being used aliased to something that does not exist? I was told that it absolutely was not.

Honestly, I didn't believe that. I believed that they had checked forwarding at the server admin, but I did not believe that they had checked user forwarding (Webmail rules). So I asked again and was told that there was no forwarding.

So, I opened a ticket and asked the customer to add Connect Support Info (generated from System Health) and configuration files. Unfortunately, the customer neglected to do a Reply-All and only sent those to me and I didn't notice until they complained again two weeks later.

This time I asked if I could possibly have access to the admin briefly. They granted that, and this is what I immediately found in the logs (all names/domains changed):


[12/Jan/2015 09:43:30] Recv: Queue-ID: 54b3dd90-0000518b, Service: SMTP,
From: <[email protected]>, To: <[email protected]>, Size: 2534,
Sender-Host: ecs-3.ecsihosting.com, SSL: yes, Subject: Re: test, Msg-Id:
<[email protected]>

[12/Jan/2015 09:43:31] Recv: Queue-ID: 54b3dd91-0000518c, Service: SMTP,
From: <[email protected]>, To: <[email protected]>, Size: 2535,
Sender-Host: ecs-3.ecsihosting.com, SSL: yes, Subject: Re: test, Msg-Id:
<[email protected]>

[12/Jan/2015 09:43:34] Sent: Queue-ID: 54b3dd91-0000518c, Recipient:
<[email protected]>, Result: delivered, Status: 2.0.0 , Remote-Host:
127.0.0.1, Msg-Id: <[email protected]>

[12/Jan/2015 09:43:35] Recv: Queue-ID: 54b3dd97-0000518d, Service: DSN,
From: <>, To: <[email protected]>, Size: 2494, Report: failed, Subject:
Returned email: Re: test, Msg-Id: <[email protected]>

[12/Jan/2015 09:43:35] Sent: Queue-ID: 54b3dd90-0000518b, Recipient:
<[email protected]>, Result: delivered, Status: 2.1.5 , Remote-Host:
127.0.0.1, Msg-Id: <[email protected]>

[12/Jan/2015 09:43:35] Sent: Queue-ID: 54b3dd90-0000518b, Recipient:
<[email protected]>, Result: failed, Status: 5.1.1 550 5.1.1
<[email protected]> recipient does not exist here., Remote-Host:
mx.txt.att.net, Msg-Id: <[email protected]>
 

As you can see, "jsmith" had apparently tried to forward his email to his text address at AT&T but had mistyped the number (obfuscated here).

Why he'd do that instead of setting up mail on his phone is a question I didn't even ask, but probably should. It may be that he has an old phone capable of texting but not of mail.


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