• Plesk Uservoice will be deprecated by October. Moving forward, all product feature requests and improvement suggestions will be managed through our new platform Plesk Productboard.
    To continue sharing your ideas and feedback, please visit features.plesk.com

Blocking faked HELO spam

J

jamesyeeoc

Guest
RH9/Plesk 7.5.x (need for 6.0.2 also)

I've managed to block over 95% of spam from coming into the server, but a lot which do come in are faking one of my valid IPs in their HELO reply, so even if I've firewall blocked their IP or put their @domain.tld into the blacklist, they are still able to dump their email into my user mailboxes.

I know there is a way to do it with Postfix, but Pf is not used on the Plesk box.

Is there any other way to do it ?

(not a newbie, am familiar with using CLI)

Thanks!
 
Well, if you have a PIX firewall, you can enable the smtp fixup protocol. I think that this checks the HELO to make sureit is not fake. Enabling this can cause other problems though.
 
Back
Top