``(thread (matching (from bob@example.com) (to bob@example.com)))``
Match any (messages in) a thread containing a message from
- "bob\@example.com" and a (possibly distinct) message to "bob at
- example.com")
+ "bob\@example.com" and a (possibly distinct) message to
+ "bob\@example.com"
``(to (or bob@example.com mallory@example.org))`` ``(or (to bob@example.com) (to mallory@example.org))``