Image spam is a technique with which spammers advertise the call to action of their messages as part of an embedded file attachment (like a .gif or .jpeg) rather than in the body of the email. These images are automatically displayed to end-users, yet the content of the image itself remains hidden from most spam filters.
The increase in more complex image spam attacks has caused spam capture rates across the email security industry to decline, resulting in wasted productivity and end-user frustration as more spam gets delivered to their inboxes. The sheer increase in the volume of spam, combined with a higher percentage of larger-sized spam, is also clogging the email infrastructure as many mail systems are unable to cope up with these spam volumes.
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