Jeff Peng a écrit : > Hello,lists, > > Some spammers use SMTP bounce to send lots of spams to our systems.For > example,they send spams to some mail servers which are lost for antispam > mechanism (They may send to the uncorrect users on those mail > servers).Surely,these spams are faked with header,whose return-path are > facked as our system's real user accounts.Then,those mail servers bounce the > spams to our users' mailboxes.While we can't reject those mail > servers,although they are abused by spammers really. > How can I deal with these spams?Thanks. >
You may try to ask these domains to stop the backscatter. A minimal step is to implement correct recipient validation. Whether they'll understand/act is another question. In the meantime, you can add them to an "outscatter" list for which you apply "non standard" checks, such as greylist them for 6 hours, randomly disconnect, throttle, ... To handle backscatter storms, you may want to block them for N hours after few of these silly mails. You can also submit them to spamcops and other lists. If you get angry, write a cgi to click and bounce these backscatter messages to their abuse/postmaster/... addresses.
