Search mail with Gnus and Spotlight (Mac OS).
You may need to install “MailSpool.mdimporter” (http://www.yoshidam.net/diary/Spotlight/) to index your mail spool files of to spotlight. That importer decodes non-UTF mails, attaching sender, receiver attributes to spotlight index.
Download the code from Lisp:gnus-spotlight.el.
(require 'gnus-spotlight) (gnus-spotlight-insinuate)
‘C-c C-n’ in the Summary buffer search your mail using Spotlight and lets you browse the result in Gnus.
Note: nnir-spotlight.el (http://github.com/kawabata/nnir-spotlight) uses Gnus nnir interface for searching mails.