Spammers are always searching for ways to bypass anti-spam filters. While the “text with tables” technique is not new, it is worth noting because it demonstrates spammers’ creativity, as well as their utilization of existing techniques.
When spammers first used table HTML codes, it began as a simple table with various cells filled in with different colors to render what looked like regular text. This basic technique has since evolved into something more complex—spammers are using a table within a table.
In the example below, the spammer first defines an outer table (137 x 43). Then, each row of the outer table itself is defined as a table. These inner tables feature a unique cell length (defined by COLSPAN) and background colors.
Carefully crafted, the above HTML shows this when rendered: