https://issues.apache.org/SpamAssassin/show_bug.cgi?id=6692

--- Comment #4 from Karsten Bräckelmann <[email protected]> 2011-11-06 
00:14:06 UTC ---
(In reply to comment #3)
>     add_header_cond all _FOO_ _BAR_

Ah, the "languages" repetition in the original example! Forgot the header name,
should have been

      add_header_cond all HeaderName _FOO_ _BAR_

Same with (b) of course.


> An alternative would be, to implement an option to remove headers if empty.
> 
>   add_header  all Languages _LANGUAGES_
>   hack_header all Languages
> 
> The first option is the traditional, unconditional add_header, or possibly the
> default as with the Level header. The second marks the header for suppression,
> if empty. This also works out of the box with stock headers, without resorting
> to the remove_header option.

And also can be used to specify a different type for conditional removal, if
desired, like "ham" or "spam" even if the stock header is added to "all".

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