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IP address is blacklisted

GEMCC asked
Last Modified: 2015-03-22

According to MXToolbox, my IP address is blacklisted by JUNKMAILFILTER.  When I go to their site per MXToolbox http://ipadmin.junkemailfilter.com/remove.php, I check to see if the address is blacklisted and it says it is not.  My Exchange server SMTPSend log states:

"554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means."

Also, I suspect there is one account that is sending out spam.  Any suggestions on what to use to find out?

There are a few messages stuck in the queue.

Please advise.

Have a great day,

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