TODO: 1998-05-01  hanne@squirrel.owl.de
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* Comment the code enough so that other people can follow my thoughts
* Use fcntl(2) for file locking (no flock(2) on Solaris)
* Check type-1 list for "pgprec" before repgp-ing to next hop
* Pad repgp messages with random garbage before encrypting
* Use memory buffers instead of temporary files
* Calculate MD5 message-ID's and discard duplicates
* Replace PGP 2.x calls with PGPlib functions
* Support for GPG encryption of outgoing messages
* More comfortable esub selection utility
* Support for Adam Back's hashcash postage
* Integration into Mixmaster
