Image spam is on the rise

At one time, spammers tried to use confusing words in message body or subject heading such as V!agr@, C alis, 0 E M to escape from being caught by Bayseian filter or key word filter that are bundled with email client. This is a game of cat and mouse chase. Spammers are already tired of this. They have come back to an old trick of image spam. All non-sense contents are contained in an image and by default, email clients and web mail interface capable of handling email in HTML format will display the image spam by default. Will end users be determined to config their email clients to only read text-based email and put image-embedded to trash ? I guess not.