Exchange 2010

hi experts
i have problem in receiving from specific domains
the following was received to the other domain users : -

Reporting-MTA: dns; mx4.itsroot.net
Final-recipient: RFC822; user@mydomain.com
Action: delayed
Status: 5.4.0
X-Supplementary-Info: < #4.4.2 X-Postfix; conversation with mail.mydomain.com[X.X.X.X] timed out while sending RCPT TO>
squranyAsked:
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Kash2nd Line EngineerCommented:
do you have any domain blocker in place. make sure the websites are allowed to send/receive from there.

also, if you are having issues then it could be the sender has got some issues, get them to check for issues at their end such as RBL, SPAM databases etc.
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TymetwisterCommented:
Do a check to make sure the domains aren't RBL'ed here:

http://www.anti-abuse.org/multi-rbl-check/
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squranyAuthor Commented:
not listed
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Satya PathakLead Technical ConsultantCommented:
As per NDR 4.4.2 its looks like a network issue server trying to send a mail but connection was broken..

Also i would suggest you to if you are using any thrid party applinace at gateway lable please check the log might help you to understand the issue.
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squranyAuthor Commented:
nothing found in the log of the firewall appliance
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squranyAuthor Commented:
Error reading SMTP packet; response to RCPT TO command expected
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