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We're doing a new install of Kerio. Internal domain is 'domain.local' and public domain is ''. Kerberos setting is to 'domain.local'.

Directory Service tab Username field is 'domain.local'
Active Directory field at the bottom is 'domain.local'.

I have verified that traffic is flowing properly using a telnet 'ehlo' session. However the server is unable to authenticate the domain user and is bouncing inbound mail stating "#5.5.0 smtp;550 #5.1.0 Address rejected".

The auth login command in telnet ehlo does complete effectively.

So it seems that I can log in to the Kerio server but it doesn't believe that my e-mail address is valid.

Any help would be greatly appreciated.

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As far as my knowledge goes, you have these issues to look into:

.local doamins:
These are used for LAN broadcast names, used in huge part by the Bonjour auto-discovery features of most modern OS's and printers etc. I would never ever user a .local domain for something like this!
Use .int or .internal or something.. if you Really need to make it different.. but...

Kerberos NEEDS to resolve!
You will never ever be able to use a Kerberos auth. from outside your LAN if it's not a domain the client computer can resolve!
Or, at least the user will not be able to login when their ticket expires after (the default) 10 hours!
Do you require a VPN connection in order to Authenticate??

What we do here, is use the same on both the inside & outside, and then make sure the DNS servers on each side resolve to the right IP's!
That way, you can set up you clients to connect to a hostname, and it will always connect to the right IP nomatter where they are.. !


Jakob Peterhänsel
Consultant - Humac A/S

Apple Certified Support Professional (ACSP)
Apple Certified Technical Coordinator (ACTC)
AppleSeed/CQF member since 1998
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