twofers a écrit : > So what makes a spammer want to use a valid email address as a return or > reply-to address to catch all the undeliverable, failure and bounced > email that occures when sending UBE spam. >
this is to beat those who use "sender verification"/sender callout/(whatever you name it). > Is there some legitimacy with spam detection on an email that contains a > valid reply-to email address? > > To me, spam is one thing, but loading a mailbox with literally several > thousands of bounced emails is abusive. I'm lucky as I have the option > to click one button and remove them all on the server, but for a user to > have to delete individually or as a group after downloading them all is > just wrong. > > Any ideas on preventing or minimizing this type of spam? > you mean the stupid bounces? well, the solution is to have sites fix their broken setup and not return a bounce if the recipient doesn't exist (they should validate recipients at smtp time) nor if the message is detected as undesired (spam, malware, whatever). until then, the only thing you can do is limit the impact. SA has vbounce.pm. depending on your MTA, you can also block some the outscatter at smtp time. google for "backscatter".
