I'm seeing BASE64 being used more and more by spammers. Any suggestions on how to catch specific content that is BASE64 encoded?
Declude JunkMail has a BASE64 test built into it that is designed to automatically detect E-mails that use base64 encoding to bypass filters.
But, the latest version of Declude JunkMail will automatically decode base64-encoded segments, so it is actually easier to catch this type of spam than other spam. Their base64 encoding backfires, making it no harder to catch, and actually making it easier to catch due to the BASE64 test.
-Scott
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