Exchange server sending out SPAM

A client called and stated that his server is sending out SPAM and he has been blacklisted by a few of his clients for doing so. Here is what was sent back to him from a client:

Feedback-Type: abuse User-Agent: AOL SComp Version: 0.1 Received-Date: Fri, 20 Sep 2013 14:10:23 -0400 (EDT) Source-IP: 64.61.11.155 Reported-Domain: static-64-61-11-155.isp.broadviewnet.net Redacted-Address: redacted Redacted-Address: redacted@ EARN ADDITIONAL MONEY WITHOUT QUTTING YOUR DAILY JOB!!!.eml Subject: EARN ADDITIONAL MONEY WITHOUT QUTTING YOUR DAILY JOB!!! From: "FINANCIAL SERVICE INC" Date: 9/18/2013 8:00 PM Hi, How would you like to earn additional income while you still go about your daily routine? Here is an offer for you, earn up to $10,000 or more monthly without quitting your daily job or career. Mail me if interested. Reply to address to rcc.official@hotmail.com FINANCIAL SERVICE INC.

What is the best method to resolve this? I am not on-site. And what is the best method to prevent this from ever happening again?

Thanks in advance for all responses... Rich
RSchiererAsked:
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Frank McCourryV.P. Holland Computers, Inc.Commented:
Find the viruse(s) on his network and eradicate it.  Also check to see if the server is an open relay.  the tools at mxtoolbox.com should be very helpful.
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suriyaehnopCommented:
You have to identify the cause of the issue. You may ask do message tracking the source of the sender.

What I did experienced before is spammer use mail server to relay email out. The email was appeared came from my exchange server. What I did after that was blocked at mail gateway from sending out spam mail to internet.

Once, the cause had been identified, i removed my domain from DNSBL.

You may ask your client to temporary removed the domain from DNSBL while do investigation.
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Alan HardistyCo-OwnerCommented:
Please have a read of my article and check the sender of the messages.  If it is a random external domain name, you are an authenticated relay and my article will tell you how to sort the problem:

http://www.experts-exchange.com/Software/Server_Software/Email_Servers/Exchange/A_2556-Why-are-my-outbound-queues-filling-up-with-mail-I-didn't-send.html

My blog also has a quick fix for stopping the problem happening ever again:

http://alanhardisty.wordpress.com/2010/12/01/increase-in-hacker-attempts-on-windows-exchange-servers-one-way-to-slow-them-down/

Alan
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