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JasonK

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One server is running dovecot IMAP (imap.domain.com), one is Kerio (mail.domain.com).

The domain has 2 MX records, with one with a priority of 10 (the dovecot one), one 20 (the kerio one).

External mails reach the appropriate account ok with some messy forwarding...

On the dovecot server, the emails for the users on the kerio one have an aliases which points to the kerio server, eg...

Joe Bloggs's actual account is on Kerio. But if a user from dovecot emails them, we've set an email address alias that says joe@domain.com -> joe<_at_>mail.domain.com

On Kerio, we've set up the mail.domain.com and also domain.com (we had to do this otherwise the maillog shows that it can't find mail.domain.com)

joe@mail.domain.com then is aliased to his actual account on Kerio, joe<_at_>domain.com


Although messy, it works as both mail servers can send within the domain and the message gets to the right person without saying 'can't find this user account'.

The Kerio server was set to relay through the SMTP server (the same one Dovecot is on) but I've changed that since to send using MX records and added SPF and Caller-ID text records into our DNS and so far seems to be working as before and users haven't reported any problems yet.

The only thing that may affect the spam thing that I can think of is our internet hostname for the Kerio server is provided by our ISP in their records. In our DNS, we've got mail.domain.com resolving to the same IP, but its probably going off the ISP's hostname rather than ours (unless you can think of a way to fix this).

Does all that make sense?

J
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rleslie70

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You should be able to change your internet host domain to whatever you want and then change the ip accordingly. your isp won't let you change the dns setting?
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phil_w

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Yes, I would think having a proper reverse DNS entry with the ISP will help a lot. Most ISPs should be able to do that for you - even BT can nowadays, and that took a while Smile

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