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I've installed KMS 6.5.2 in trial mode on my Win2003 server, which also hosts some active websites. I've changed the SMTP server port and the webmail/http port to nonstandard values per the instructions, and I can log into webmail and send via KMS's SMTP just fine.

The problem I have is with receiving mail - mail sent to this domain from the outside is never received, and there's no bounce message.

I think I've set up DNS correctly:
- the domain is
- its MX record is, and it's an
A record, not a cname
- The IP address of the MX record resolves correctly to the

No firewalls are in place in either Windows or the ISP.

Is there some crucial step I'm missing regarding Kerio's configuration or DNS setup?

- Andrew

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Well, the problem seems to have magically fixed itself - must have had to do with MX records needing time to expire in DNS.

One thing though - I set the SMTP service back to port 25, and at that point everything started working. This is contrary to the docs, but works for me because we don't have SMTP active within IIS. Doesn't SMTP need to be set to port 25 to receive email from outside domains?
Pavel Dobry (Kerio)

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SMTP server MUST run on port 25 in order to receive email from other servers. This is a basic principle of email delivery. Other servers don't know on which port your server is listening so every server must use same port - 25.
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