Solved

Spam through a specific user exchange 2003

Posted on 2012-03-19
2
283 Views
Last Modified: 2012-03-23
So, I checked our Exchange 2003 mail queue this morning and saw that there were 4,019  spam emails sitting in the mail queue.  I turned up the logging settings for authentication and SMTP protocol. After reviewing the event logs I determined that that the spammers were authenticating through sales@mydomain.com. I disabled this account and there is no more spam entering the queue.  When I re-enable the account a large number of spam emails enter the mail queue every few minutes. I reset the password to this account thinking that that would eliminate the spammers ability to use it to authenticate but spam is still piling in.

I disabled the sales@mydomain.com account again and haven't seen any spam in the queue for a while now. How can I keep this account active without allowing the spammers to authenticate against it? I would think that changing the password would work but it doesn't. Any ideas?
0
Comment
Question by:David11011
2 Comments
 
LVL 76

Accepted Solution

by:
Alan Hardisty earned 500 total points
ID: 37740047
After you have changed the password - you HAVE to restart the Simple Mail Transfer Protocol Service otherwise the spammers can still use the old username / password.

Once you have restarted the service, they will have to either work out the new password or find another account with a weak password to abuse.

Some useful reading for you from my blog:

http://alanhardisty.wordpress.com/2010/09/28/increase-in-frequency-of-security-alerts-on-servers-from-hackers-trying-brute-force-password-programs/

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

Alan
0
 
LVL 2

Author Closing Comment

by:David11011
ID: 37758125
Thanks Alan,
Restarting the SMTP server did the trick. I figured that the user authenticated against the domain controller every time it sends or receives an email. I guess I was wrong. You have to restart the SMTP service for password changes on the domain controller to take effect on the exchange server.
0

Featured Post

U.S. Department of Agriculture and Acronis Access

With the new era of mobile computing, smartphones and tablets, wireless communications and cloud services, the USDA sought to take advantage of a mobilized workforce and the blurring lines between personal and corporate computing resources.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

MS Outlook is a world-class email client application that is mainly used for e-communication globally.  In this article, we will discuss the basic idea about MS Outlook, its advanced features, and types of MS Outlook File formats.
As tax season makes its return, so does the increase in cyber crime and tax refund phishing that comes with it
Established in 1997, Technology Architects has become one of the most reputable technology solutions companies in the country. TA have been providing businesses with cost effective state-of-the-art solutions and unparalleled service that is designed…
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

808 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question