fkoyer commented on PR #46:
URL: https://github.com/apache/spamassassin/pull/46#issuecomment-6547618050
I agree with inspecting all parts that are visible to end users. IMHO, the
text/plain part of a multipart message is generally not visible to the average,
non-technical end user unless their administrator has disabled HTML email in
which case they would also want to set `multipart_alternative_preferred_part`
to `text/plain`. I also haven't seen any messages where there was spammy
content in the text/plain part that wasn't also detectable in the text/html
part. Not saying it doesn't exist, just asking for examples. Maybe we need a
way to inspect **only** hidden/invisible parts.
In my experience, including the non-visible text/plain part in **all** rules
results a lot of false positives, partially due to the `tflag multiple` rules
but also due to the parser picking up bogus URIs from unfortunate wrapping &
joining.
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