WISHLIST

* Review logging to ensure that it's as consistent as it could be.
* URL in SMTP error messages.
* Call adnshost only once.

IMPORTANT

* Allow avf to succeed on ip-literals
* Do something to allow `irritated' etc. to be less `rude'.
* MBM's bug with quoted local-parts
  (to sauce-maint==ian@davenant, 30 May 2001 17:20:19 +0000
   and my reply 26 Sep 2001 00:44:11 +0100)
* MBM's bug with RBL and TXT vs A  (Thu, 31 May 2001 13:14:49 +0100
   and Wed, 6 Jun 2001 19:14:38 +0100)
* Allow A RR masking
