I added httpd.exe to whitelist (Process to Exclude list), but the problem still persists. Any ideas what must I do to solve this problem?
How did you add it to the list exactly?
You describe taking the right steps to correct the issue; that you say it's not working means your steps are a bit off.
Mcaffee has a window called "Processes to Exclude" httpd.exe was added to that list. My webserver logs say that port 25 is getting blocked. So I think httpd.exe on port 25 is getting blocked by Mcaffee.
Are you doing this via ePO, or locally on the server where VSE is installed?
You need to confirm if doing it via ePO that you are updating the correct policy.
You need to confirm if doing it locally that the change is not being overwritten by policy enforcement.
If you need help with either of these things, or you're adamant you're doing it right but something else could be failing (like policies not reaching the client), then you ought to contact McAfee Support.
Are you using the exclusion list under On-access scanner settings or under Access protection settings?
You have to use the one under Access Protection->Anti-Virus Standard protection->Prevent mass-mailing worms from sending mails and put the httpd.exe process into the excluded processes list.
If you already did it then look what wwarren says about an ePO-managed node or not.