https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6389

--- Comment #7 from John Wilcock <[email protected]> 2010-04-07 07:39:55 UTC ---
Created an attachment (id=4735)
 --> (https://issues.apache.org/SpamAssassin/attachment.cgi?id=4735)
Another FP

My first FP sample was indeed "saved" by ALL_TRUSTED (and BAYES_00). 

Here's another one, an opt-in newsletter that was only saved by
RCVD_IN_RP_CERTIFIED and RCVD_IN_RP_SAFE (it also had a valid DKIM signature,
which I've no doubt invalidated by obfuscating the recipient's address). 

Any messages from people with highbit characters in their names, and with
highbit characters in the subject and body will potentially hit the rule - and
that is inevitably a fairly common scenario for non-English mail. 

What appears to be saving this rule from more FPs is the check for base64
encoding of the headers. Thunderbird, for instance, appears to use
quoted-printable encoding for ISO-8859-1, its default charset, and only
switches to base64 for UTF-8 and other multibyte charsets. 

Does the rule actually hit much spam that wouldn't be caught otherwise? On my
two low-volume servers I have only one spam hit that would have scored under 10
points without this rule, and none that would have been FNs.

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