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sschaetz

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I've done a bunch of searches and created a support ticket a day ago, but I'm wondering if anyone has a concrete solution to this issue (as it is a known Kerio issue).

Right now, half of our users are using Kerio 6.3, and the other half are using Exchange 2003. Kerio acts as the main MX server for all incoming mail. If the user is on Exchange, it forwards the mail over to Exchange. It works pretty well.

Lately, a few domains that are emailing use (qwest.net being one) get a bounced message that says "#5.3.0 SMTP; 550 5.3.0 Mailbox alias could not be expanded". The same message in the Kerio log looks like this: "Result: failed, Status: 5.1.8 501 5.5.4 Invalid Address".

I've done a lot of research, and it comes down to their email server being improperly configured.
http://support.microsoft.com/kb/291828

Every time I do a DNS check on an offending domain, it usually shows a warning under "Mail server host name in greeting".

I've performed KB 291828 from Microsoft on our Exchange server, which works if the person sends directly to the exchange server (ie <_a.t_>exchange.domain.com).

So what's the deal with the Kerio server. Anyone have a guess on how to fix it?
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scottwilkins

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We started seeing this error right after our 6.4.0 update. Doesn't happen a lot, and so far only between internal users (user to user e-mail). Doesn't stop the message either, as the recepient does get the message intact. Just annoying for us right now.
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sschaetz

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scottwilkins wrote on Thu, 31 May 2007 20:04

We started seeing this error right after our 6.4.0 update. Doesn't happen a lot, and so far only between internal users (user to user e-mail). Doesn't stop the message either, as the recepient does get the message intact. Just annoying for us right now.


Interesting.

We are at 6.3.0, and it happens consistently from certain external domains only. Also, the message does not go through.

We probably have totally different issues, but we have the same error codes.
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sschaetz

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Well, since my Kerio subscription expired, Kerio is refusing to support me for this issue -- even though it is a known issue as reported by them on this message board.

Nice.

Any replies on how to fix this will be greatly appreciated.
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Pavel Dobry (Kerio)

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sschaetz wrote on Thu, 31 May 2007 23:42

Well, since my Kerio subscription expired, Kerio is refusing to support me for this issue -- even though it is a known issue as reported by them on this message board.

Nice.

Any replies on how to fix this will be greatly appreciated.


I'm not aware of any note that this is a known issue. Where did you read it?
From the first post it is clear that Internet Hostname in KMS is incorrectly configured.

Knowledge Base: http://kb.kerio.com/.
Looking for technical support? http://www.kerio.com/support
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sschaetz

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[Updated on: Fri, 01 June 2007 17:17]

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scottwilkins

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Seems there may be multiple "issues" here with similar errors. Ours is just the "#5.3.0 SMTP; 550 5.3.0 Mailbox alias could not be expanded" error, and within the same domain, not externally sent e-mails. None of the solutions here were much help for that yet, but very appreciated though. (I know I know, file a support ticket...)
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