junk email

According to a report of Symantec Corp.'s MessageLabs Intelligence unit unsolicited e mail
 accounted for 90.4% of all messages received on corporate networks during April, an increase of 5.1% from a month earlier.

In addition to using botnets spammers in recent months have been experimenting with a new way to sneak unwanted e mail past corporate filters.

Spammers have now gone back to a years-old tactic of using images for their messages, a security researcher warned.

Image spam had its peak in late 2006 and early 2007, and was successful at slipping through filters, which were designed only to parse text and look for such things as links. However, it's surprising it is coming back, as spammers know that anti-spam vendors have already figured out how to detect that type of junk mail. Nevertheless, image-based spam accounted for about 25% of all spam at the end of last month.