Spammers are trying to deliver the message to you using any method possible. Recently, there is more ASCII spam message. ASCII spam is using the ASCII low graphic art technique which the message is formed by characters. Since the message is formed by set of characters, the system cannot detect it is a spam message and thus cannot filter it. There’s also a ASCII generator to help to make things easier. See, it is not easy to stop spam. We just have to work hard to clean it all.

[via CNET]