TODO: 1998-01-05  hanne@squirrel.owl.de
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* include a program that lets you test your regex block files so you make
  sure they don't block things you don't want them to
* comment the code enough so that people other than me can follow my thoughts
  (and thus, correct how they are flawed)
* support for multi-line headers as in Mixmaster
* support for DSS/DH keys (as in Lutz's IN-PGP version)
* support for Adam Back's hashcash postage
* mixmaster integration
