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6.0

Fixing and preventing mail /contact forms Spam

Asked by Denisvt in Linux Network Security

Tags: plesk

Hi,
We run a few dedicated servers and are more and more dealing with our servers being used to send thousands of junk mails through poorly designed contact forms. Some clients don't have a clue about PHP and insist on copying a few lines of code from an obscure site, until we find our server brought down by thousands of spams.
Right now I can see our (Plesk server) QMail queue trying to handle over 11,000 junk mails being bounced. I increased some levels of securoty such as reject, do not reply with "does not exist" etc, but still I fail to see which domain this is coming from ? The mail queue keeps beings hit and I have to act ASAP.
Moreover once I have found this, while we cannot keep an eye on every stupid page a client uploads, how could that nuisance be prevented, or fixex immediately when found ?

Thank you for your time.
 
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Zone: Linux Network Security
Tags: plesk
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