On Wed, 1 Apr 2020, at 06:22, raf wrote:
> e.g. Add a CC header to [email protected] whenever
> sending/replying/forwarding from [email protected] unless the
> email is already going to [email protected].

I think a combination of hooks or only a send2-hook could be used.

How about something along these lines (not tested):

send2-hook "~f [email protected] !(~C [email protected])" "my_hdr cc: [email protected]"

I do not know if my_hdr would respect headers that are already there. For 
example, if you set a header using the editor CCing a few people, Fred should 
only be added.

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