sɹǝʇlᴉɟ ɯɐds pᴉoʌɐ oʇ ʇxǝʇ uʍop ǝpᴉsdn ƃuᴉsn sɹǝɯɯɐdS

Spammers are using a new trick to avoid spam filters. They are using backwards writing. They are using left-to-right override code intended to facilitate the use of bi-direction text.

Researcher Brian Bebeau wrote: "[Phishers] use it to reverse the email text in an attempt to bypass spam content filters."

"While some content filters might check for generic phrases like 'Dear customer', they probably won’t be looking for the reverse text.

"Likewise, 'woleb knil eht no kcilc' will probably not get a second look, unlike 'click on the link below'."

Virus Total maintained the Spammer's Compendium that listed many of these tricks.