Exchange Server is rejecting message after "MAIL FROM" with "500 5.3.3" with tarpit despite being a Trusted Receiver

Posted by Don Rhummy on Server Fault See other posts from Server Fault or by Don Rhummy
Published on 2011-12-02T18:52:51Z Indexed on 2012/08/30 3:40 UTC
Read the original article Hit count: 562

Filed under:

exchange

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smtp

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exchange-2010

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smtp-connector

I'm getting the message: "500 5.3.3 Unrecognized command" from Exchange server and seeing in the Exchange Server logs that it's tarpitting my smtp sender despite the fact that:

I added a Receive Connector for my ip that allows connection, uses "Externally Secure"
I ran the commands (with the actual server name):

CODE:

Set-ReceiveConnector "MyTrusted connector (Servername)" -MaxAcknowledgementDelay 0

Set-ReceiveConnector "MyTrusted connector (Servername)" -TarpitInterval 0

Despite all that, it STILL fails! Any idea what's wrong?

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