+Review Fabio Rossi's contribution, fetchmail-mda-fork.*, polish and merge.
+
Return PS_ERROR, not PS_SYNTAX, on failures for preconnect/postconnect.
Credit to Gene Heskett, 2012-07-31, fetchmail-users@ list.
- validate addresses to avoid invalid address issues
+ consider if a bad-header interaction is desired
-
-- merge up 6.3.20-6.3.22 fixes and NEWS