Sup is a very good email program written by William Morgan (and
others) and is the direct inspiration for Notmuch. Notmuch began as
an effort to rewrite performance-critical pieces of Sup in C rather
- than ruby. From there, it grew into a separate project. One
+ than Ruby. From there, it grew into a separate project. One
significant contribution Notmuch makes compared to Sup is the
separation of the indexer/searcher from the user interface. (Notmuch
provides a library interface so that its indexing/searching/tagging