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I have been seeing a lot of dropped connections as of late. According to my debugging log, the connection is dropped immediately after my server issues the EHLO command. When the EHLO command is issued, the target smtp server closes the connection.

Also, when communicating with someone at the target server end, I got this message in reply:

"Their mail server "mail.XXX" is not responding to our mail
servers verification on the domain name.
This is enabled on our mail server as a protection for spam.
The specific log file on our mail server is below.

9072: Sep 21 18:56:55 YYY sendmail[1987]: NOQUEUE:
mail.XXX [216.XXX.XXX.XXX] did not issue MAIL/EXPN/VRFY/ETRN
during connection to MTA

As a result, if no response is received from their mail server, no email
from mail.XXX will be delivered to any user."

XXX and YYY are my additions.

The hostname is set correctly on our server. I can telnet into it on port 25 and issue both HELO and EHLO commands and get valid responses.

Is there someting possibly misconfigured on our server, or is something possibly wrong at the other end?

Thanks for any help on this!

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