the necessary keywords to look them up in the manual, ChangeLog or other
sources of information.
+2005-09-14:
+
+ The $smtp_envelope_from variable has been removed in favor of the
+ general $envelope_from_address.
+
+ The $envelope_from option has been renamed to $use_envelope_from.
+
2005-09-07:
+ SASL 1.x support has been removed.
+
All patterns may be prefixed with = instead of ~ to enable
string search instead of regular expression match.