Spammers shift tactics to evade filters
Spammers are giving the old trick of joe-jobbing a fresh twist in a bid to fox email filters. Conventional joe-jobbing involves forging the sender's email address so that some poor innocent - rather than a spammer - has to wade through bounced messages sent to invalid email addresses.
Instead of forging the sender's email address (a trick that's easily detected by anti-spam technologies) spammers are deliberately sending their messages to an invalid email address at a high profile company using a forged "From" address at a target company. The email is then bounced as an unrecognised email address and sent back to the "sender". Since the IP address and the email domain address now match, the junk email message stands a better chance of avoiding detection by some anti-spam technologies. Because of this there's a better chance that an item of spam will arrive in the inbox of end users Joe-job spammers shift tactics to evade filters | The Register
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