Solved

Spam through a specific user exchange 2003

Posted on 2012-03-19
2
279 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
Comment Utility
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
Comment Utility
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

Shouldn't all users have the same email signature?

You wouldn't let your users design their own business cards, would you? So, why do you let them design their own email signatures? Think of the damage they could be doing to your brand reputation! Choose the easy way to manage set up and add email signatures for all users.

Join & Write a Comment

ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.
This article explains in simple steps how to renew expiring Exchange Server Internal Transport Certificate.
In this video we show how to create a mailbox database in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Servers >> Data…
This video discusses moving either the default database or any database to a new volume.

743 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

Need Help in Real-Time?

Connect with top rated Experts

13 Experts available now in Live!

Get 1:1 Help Now