As Keith pointed out, (with a humorous citation from Mark Twain),
the two uses of "very" added nothing to the description. Also,
"large collection of email" was repeated uselessly.
Notmuch is a system for indexing, searching, reading, and tagging
large collections of email messages. It uses the Xapian library to
-provide fast, full-text search of very large collection of email with
-a very convenient search syntax.
+provide fast, full-text search with a convenient search syntax.
Notmuch is free software, released under the GNU General Public
License version 3 (or later).