This is just for confirmation really...
A pipe and a filter are invoked by the same command, '|'. For a normal
pipe, procmail hands off the message to the pipe, end of story. For a
pipe acting as a filter, procmail will take whatever is returned from
the pipe (most likely changed), to be the message it previously handed
off. Is this true?
If so, if you use the h flag in the recipe, procmail will only hand off
the headers, and when using the fh flags, procmail will reattach the
(changed?) header to the original body. Is this true?
Thanks,
Steve :)
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