SMTP and E2 w/SP3

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I am running Exchange Server 2000 with SP3 installed on an internal network.
All outside mail is handled through the ISP email and there is no forwarding
to the internal Exchange server. Until last week I had not problem but a
SMTP problem has started.

Some outside email get forwarded some do not. It is always the same that
don't.send and remain in the queue. The error is the Queue is "An SMTP
protocol error occurred."

Example: All mail to be delivered to any user @cox.net ends up the folder in
the queue named cox.net
All mail to be delivered to any user @vzw.com gets sent

Sounds like a DNS problem. Any ideas?



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