Recently we have noticed that Postini has been having some difficulties with a particular type of image spam. In the email headers there seems to be a forged X-Spamshield-Status-DATA header listing: Skipped, authenticated user.
These messages also all seem to contain an unusual unsubscribe message at the bottom of the email. Instead of the typical Unsubscribe link it is an image:
Until anti-spam vendors get signatures in place to stop this spam, we are recommending that putting a content filter in place either on your anti-spam solution or on your mailbox to move messages with the “X-Spamshield-Status-DATA: Skipped, authenticated user” header to Junk.
We do not recommend clicking the image or trying to unsubscribe to these messages as you will just validate your email for spammers.
MxToolBox is on Twitter! Make sure to follow us so that you stay up to date on any changes to our system, new blogs, new information etc.