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Yahoo! goes grey-list
By Dave-C - CEO | August 22, 2007
Yahoo! introduced an interesting concept in mail filtering this week, by introducing a grey-list system to apparently check that mail incoming to their servers is from ‘genuine’ mail servers, and not fake ones set up by spammers using dynamic IPs etc.
It works in such a way that the first attempted mail delivery from an outside server gets bounced back to the sending mail server with a “try again later” message, and will then accept the mail on the next go around, which depending on your ISP’s mailserver retry settings, may be an hour or so. It’s basically to test that your message has come from a REAL mail server, and not some hacker/spammer.
I guess that they’ve got to do something because of all the fake NO-SPAM headers that have suddenly appeared, along with the nasty pdf and fdf (fake pdf) attachments, and a pile of other **** coming out of China, Hong Kong, Taiwan, Russia, etc., but it doesn’t help when it comes without warning, and people start asking why their messages aren’t appearing in Yahoo! Groups, etc, until 2 or 3 hours after they posted.
On the Netnibble servers we hit in excess of 6 figures of these in the last 24 hours - I dread to try to pro-rata that into the millions that Yahoo!, GoogleMail, etc, are trying to handle.
Tagged as:anti spam email GoogleMail Yahoo!Topics: Email traffic |
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