* Use PCRE (http://www.pcre.org) for mattern matching.
+ Most visible change is a different syntax for subexpression matching,
using (...). MATCH2 becomes MATCH1, MATCH3 becomes MATCH2, etc...
+ "w" account option dropped.
+ During a transitional period, setting MAILDROP_OLD_REGEXP
reverts to the old pattern matching engine.
* Do not autoreply to messages with an Auto-Submitted: header, unless
it's contents are "no". Add Auto-Submitted: auto-replied.
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