how to teach sendmail to delete a specific header line?

[Andy Spiegl <debian-user.andy@spiegl.de>]

Dear Gurus!

I am clueless as to how I can tell sendmail that it deletes the "X-Mailer:"
header line in all outgoing mails.  I am sure this can be done, but after
reading quite a bit of documentation I still don't know how to do it.

Would some kind soul please give me a hint?

Thanks so much in advance!
 Andy.

-- 
 Dr. Andy Spiegl, Radio Marañón, Jaén, Perú
 E-Mail: Andy@spiegl.de, Andy@radiomaranon.org.pe
 URL: http://spiegl.de, http://radiomaranon.org.pe
 PGP/GPG: see headers
                                o      _     _         _
  --------- __o       __o      /\_   _ \\o  (_)\__/o  (_)
  ------- _`\<,_    _`\<,_    _>(_) (_)/<_    \_| \   _|/' \/
  ------ (_)/ (_)  (_)/ (_)  (_)        (_)   (_)    (_)'  _\o_
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 A person's true character is revealed by what he does
 when no one is watching.