Having trouble email one of our customers, it seems to be isolated to this one customer and I have checked DNS, Spamhaus and everything is good there. Any thoughts on the errors message below?
We run Exchange 03 sp2 and it happens even if you try to email one person or a group of people over at the other company...
Your message did not reach some or all of the intended recipients.
Subject: Testing email
Sent: 7/26/2007 10:30 AM
The following recipient(s) could not be reached:
email@example.com on 7/26/2007 10:30 AM
The message cannot be delivered due to a configuration error on the server. Please contact your Administrator.
<Mymailserver.domain #5.3.0 smtp;530 5.3.0 Invalid ehlo/ehlo domain.>