+- CRYPTO: use SASL?
+- make logfile more useful (redirect not only in daemon mode)
+- close/reopen logfile on certain signals (for newsyslog/logrotate
+ support)
+- for virtual mapping, we don't currently support local user aliases or
+ regexp matching with replacement. This would be useful for hosting
+ several virtual domains in one multidrop mailbox, as in
+ qmail/courier's:
+
+ @one.example:bob-one
+ @two.example:bob-two
+
+ Result:
+ some@one.example maps to bob-one-some@serverdomain
+ another@two.example maps to bob-two-example@serverdomain
+
+ we can strip the bob-*, but but we don't support domain catchalls
+ here, and we cannot currently delegate or rewrite the remaining
+ one-* or two-* users in a useful way. All local parts of the upstream
+ domains must be known and mapped in the configuration file.
+ (See fetchmail-users, Michelle Konzack, 2009-05-03, "4 multidrop but one
+ destination server" and followup)
+
+ This probably entails some form of extended user mapping inside
+ fetchmail, for map_name() in transact.c, and possibly
+ find_server_names() ibidem.
+- more verbose diagnostics, what, why, how, ... (what does fetchmail do, what
+ does it expect, what does it get instead, what does that mean, how can the
+ user fix it; references to the manual)
+