On Thu, 22 Feb 2018 15:54:45 +0100
saqariden wrote:

> Hello guys,
> I have the following SA rule which is supposed to block base64
> encoded mails:

This may be dangerous.  If someone doesn't wish to use 8bit text then
base64 encoding of UTF-8 is a sensible choice; QP is very inefficient
unless the text is almost completely ASCII.

> body                EN_BASE64_B        /(Content-Transfer-Encoding: 
> base64\sContent-Type: text\/(plain|html); 
> charset="?utf-8"?)|(Content-Type: text\/(plain|html); 
> charset="?utf-8"?\sContent-Transfer-Encoding: base64)/i
> describe             EN_BASE64_B        TEXT OR HTML B64 ENCODED
> score                 EN_BASE64_B        5
> this is the mail that i want to stop:
> the rule don't match for this mail, but it match when i had an empty 
> line like this:
> How can i do to match the both, with the empty line and without it?

body rules check only the text that's visible in a mail client
(including the subject text). This rule only works at all if you make
the mime unparsable.

For mime you need "full" instead of "body". You then need an
explicit \n between lines.   

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