Some emails from Exchange coming back as undeliverable

By mlieberman ·
The company I work for is running SBS 2003 and we just got a static IP so we began routing emails via DNS since our ISP blocks routing via smarthost. We have an external webhost that uses our domain name, for security's sake I'll call it, however the internal Exchange has it set up also as as the domain. Most of our emails go through no problem but a few emails get blocked with this message

Your message did not reach some or all of the intended recipients.

Subject: TEST
Sent: 4/2/2009 12:58 PM

The following recipient(s) cannot be reached:

'' on 4/2/2009 12:58 PM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
< #5.7.1 smtp;550 5.7.1 Access denied>

I have a feeling, but could be totally off base, it is because we have an external webhost for hosting our website and their server resolves to point to our webhost not our static IP, but we want to use Exchange eventually for all of our company email. How do I resolve this? Would changing the MX record fix this?

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Re: email

by christianshiflet In reply to Some emails from Exchange ...

I am not positive that it would generate the exact NDR that you are getting, but it may be due to a reverse DNS, or rDNS, failure. You should, if you haven't already, set up mail exchange, or MX records, with your domain registrar. You can have multiples for a single domain and should have one for each IP that may send mail on behalf of your domain. So, you should have one for your static IP as well as your webhost, most likely.

If that helps or you have further questions, please let me know.

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I will check that out.

by mlieberman In reply to Re: email

I will check that out as soon as my webhost adds the MX record. For some reason they allow you to change an MX record via their control panel but not add an MX record. So once that goes through, hopefully it fixes this issue.

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