McAfee Blocks Port 25

If you are a McAfee customer, and install their offerings on your Exchange servers, you should take note of the following...

"It appears the new McAfee 8.01 (or 8.0.0) client blocks port 25 from malicious WORM attacks which is great for a client desktop and catastrophic for a server!"

More info at Flaphead.

Chris Meirick on November 16, 2004 at 05:00 AM in Useful Info
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Tracked on Nov 21, 2004 8:07:07 AM


Why would anyone put the McAfee Antivirus client on a an Exchange Server?

Posted by: William Lefkovics at Nov 16, 2004 11:29:55 PM

I had a problem of port 25 being blocked for 2 weeks until
I noticed that it was being blocked by McAfee. When I un-
check the option that blocks port 25 from mass mailing
worms, it gets blocked again. How is this problem solved? The port being blocked is on the
server. Therefore, each time the is outbount mail on the queue, I have to Disable McAfee.

Posted by: Fredrick Liemisa at May 9, 2005 5:41:15 AM

Has anyone managed to get McAfee 8 to work with Exchange 2003 without causing issues? We just find it blocks emails coming in (Pop3) and then causes Exchange to fail it's delivery to the clients.

Posted by: Activair at Nov 16, 2005 6:14:15 AM

Why do i keep getting a 'Potential Worm Activity Detected' when I send an image to a friend. Its compliments of McAfee virus scan?

Posted by: bri at Dec 4, 2005 8:05:00 AM

hi I've hosted my website in a server and installed mcafee for security purpose. problem is that MCAfee autonatically
blocks Port 25 of server due to this we r not able to send

I've to manually close automatic update and then send mail and
start again automatic update.

Please send me solution of this


Posted by: dhirendra at Dec 28, 2005 1:37:54 AM

Unchecking port 25 is the correct way to do this. However, you have to look at your policies in ePO to make sure you have assigned the policy to the correct servers. We have a group for all of our mail server and that policy says to allow port 25. You will find this setting in the Access Protection Policy

Posted by: Doug at Jan 9, 2007 1:51:19 PM