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AN SMTP protocol error occured

Posted on 2013-05-10
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Last Modified: 2013-05-15
Server Type: Server 2003 STD SP2
Exchange 2003
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Recently we were attacked by hacked mail servers. we got blacklisted at 3 different places tier 1. it has been about 2 days that we are no longer listed and everything has been resumed back to normal.

Except that some messages from some domain are stuck in my queue and are stuck on retry
highlighting  that folder allows me to see a message that states smtp protocol error

another folder states connection was dropped by remote host

no changes where made to the configurations on the server

Most emails are being sent with out a problem.
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Question by:IT_Pax
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3 Comments
 
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Expert Comment

by:Simon Butler (Sembee)
ID: 39155153
The fact that you are are off the blacklists doesn't mean you will get email delivered to all places. A lot of systems will cache blacklist list results. Therefore it can be some time before email can be delivered reliably. If you must send email to those domains, setup an SMTP Connector with a smart host, using your ISPs SMTP server as the smart host to get the email out.

Simon.
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Accepted Solution

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IT_Pax earned 0 total points
ID: 39156487
Thanks Simon.

I was able to send out to those domains by fixing a reverse DNS mismatch issue.

However, I will take your advice should this issue arise again in the future.

Cheers
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Author Closing Comment

by:IT_Pax
ID: 39167418
Quick to respond. Gave the best possible answer with the information provided.
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