02 October 2009 ~ 1 Comment

Firewall, NAT and DNS, reverse DNS entries do not match Error

If you host your own email behind a NAT device or firewall, you've probably seen this issue come up at least once in your enterprise. Recently, I've received some complaints about exchange 2007 bouncing email messages with error messages like this:

mxi5p.craigslist.org #554 5.7.1 Read More

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31 July 2009 ~ 0 Comments

Email Server Generates “#500 Firewall Error##” Error

Email Server Generates “#500 Firewall Error##” Error

We upgraded our mail server recently to Microsoft Exchange 2007 and users started experiencing problem sending emails to multiple recipients on same domain.

The error message:
Diagnostic information for administrators: Read More

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