troubleshooting Question

Exchange Server Event ID 7004

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NGPSoft1Flag for United States of America asked on
Exchange
7 Comments2 Solutions723 ViewsLast Modified:
I am having an intermittent problem with messages bouncing back.  After doing some research I have found that my Exchange server is attempting to connect to server that has the A record for the domain but does not connect to the MX record of the domain.

Example:
I try to send to user@abc.com and get a bounce back of “550 not local host abc.com, not a gateway>”.  I check the Event log and find Event ID 7004 telling the following:

This is an SMTP protocol error log for virtual server ID 1, connection #8829. The remote host "55.55.55.55", responded to the SMTP command "rcpt" with "550 not local host abc.com, not a gateway  ". The full command sent was "RCPT TO:<user@abc.com>  ".  This will probably cause the connection to fail.

I then look up the MX records for abc.com and find the following:

abc.com. MX IN 28800 mail1. abc.com. [Preference = 10]
abc.com. MX IN 28800 mail2. abc.com. [Preference = 30]
mail1.abc.com. A IN 28800 33.33.33.1
mail1.abc.com. A IN 28800 33.33.33.2

I then look up the A records for abc.com and find the following:

abc.com. A IN 28800 55.55.55.55

Bascially, my mail server is connecting to the A record of the domain vs. the MX record of the domain.  In most cases, I can resend the same message later to the same email address with no problem.  This problem does not happen all of the time.

Why would this happen?  How can I correct the problem.
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