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we recently (yesterday) migrate from Mdaemon 8 to KMS 6.3

Our server hosts 25 accounts on 5 different domains.
All goes fine except when one send an email from an domain 1 account to domain 2 account.

It seems that KMS try to resolve the IP adress (MX) from internal domains. Unfortunatly, as we are behind a firewall/router, the DNS return the public address of the domain 2. And, off course, KMS won't be able to connect to that IP (it should use the private IP).

Why KMS simply deliver the email in the domain 2 mail box without the use of a TCP connection ?

Our old Mdaemon was acting that way. So, for the moment, I kept it runing only as a Smtp relay server.

Is their a way to change that ?


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My experience is different. If you have and

added as domains in KMS and you send something from

userA<.a.t.> to


KMS does not do any MX lookups, but sends the mail internally, it does not leave the server.

Why do you think it does a MX lookup? Any log files indicating that?

Regards, Pascal

Dexion AG - The Blackberry Specialists in Switzerland

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simply because the sender receive an error claiming that domain2 doesn't exist.


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I had the same problem. Luckily at this site, they had an internal DNS server, so creating the MX records on that and pointing the mail server to it solved the problem.
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