Quote:
Originally Posted by SideshowBob
You can't actually filter on "Bcc" as it should never appear in incoming mail.
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"Should" is right. But some emails - perhaps not created by 'proper' clients, but built a line at a time (eg in a scripting language) do sometimes contain it. You might almost say that finding such a header could be a good indicator that a mail is spam.
Also, even email clients which properly don't include BCC in sent mails have been known to include it in the logged/sent copy retained by the sender (so the sender can later see who it was BCCed to). If someone resends that, I'm not sure that the client necessarily strips the BCC header out.