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uyulala

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Hi!

To ensure TLS-protection for all mail traffic, one of our customers wants us to not use MX-based delivery for email addressed to them, but rather to deliver the mail to a predefined SMTP server.
What I want is to specify statically the SMTP server to for delivery of all mail for a given internet domain ( *<_at_>ourcustomer.com). All other mail should be delivered as normal (which for us is to relay it to our ISP's SMTP server).

After scanning the documentation and knowledge base, I can not see how this can be done?

Is it possible?

Thanks!
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dominic@cbx.com

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If you truly relay through your ISP, then you have no control over email delivery. Your ISP does all the DNS/MX lookups, on your behalf.

If your mail server sends of its own accord, you could fake DNS/MX records either through your locally managed DNS Server (if your running one), or through the hosts files (assuming your running Kerio Connect on a variant of *NIX [Linux, Mac OS X])
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uyulala

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Thanks. That's sounds like a solution when you do not relay. Unfortunately we do. When we turn off relaying, we get problems with blocking. Among others, Yahoo do not accept mail from us. I have no idea why.

I wonder wether it is possible to override relaying for some recipients and send them yourself, while relaying the others?
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dominic@cbx.com

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I have heard of people implementing a domain-specific relay in postfix, which could work in this scenario. But unfortunately, I don't believe that Kerio connect offers this option.
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dominic@cbx.com

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If your curious, a quick search brought up this: http://forum.soft32.com/linux2/postfix-smarthost-relayhost-d omain-ftopict29748.html

Though interesting, its not a solution to your question as it isn't Kerio Connect. Your best bet may be to contact your ISP and see if they can provide a solution for you.
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uyulala

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Thanks again, dominic. Thats really interesting. Maybe not a short-term solution, but anyway.
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