Bulk emailers and PIX

[webnetwiz]

Hey, everyone. My email server receives about 100 identical emails from Ebay and a few other bulk mailers. It seems that the PIX does not send through an acknowledgement to the sender's mail server that the message has been received. This only happens to a few bulk mailers, cause others (like this forum) go through just fine. It's not my email server, because the logs and user mailboxes confirm that sender's server contacts my email server at a certain interval.

Any ideas? For now, I do have the fixup protocol smtp 25 enabled, but I'm thinking of turning it off.

 

[pinkus05]

Hi!

Also noticed this with PIX? Could you provide me more info on this if you have some? thanks.

 

[webnetwiz]

Fixed the problem by disabling the MailGuard feature.
Command: pix#(config)no fixup protocol smtp 25

Let me know if it works for you.

 

[pinkus05]

ok thanks it worked

 

[berford]

Careful turning off MailGuard. Make sure you check your SMTP server regularly. Perhaps install a Host Based IDS on the mail server. The PIX was blocking a whole bunch of less than good SMTP commands. You'd be much more vulnerable to several simple SMTP hacks with MailGuard off.