How does notmuch track mails?

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+Date: Tue, 9 Aug 2016 16:02:23 +0200\r
+From: Matthias Beyer <mail@beyermatthias.de>\r
+To: notmuch@notmuchmail.org\r
+Subject: How does notmuch track mails?\r
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+Reply-To: Matthias Beyer <mail@beyermatthias.de>\r
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+Hi,\r
+\r
+(I'm not subscribed to your ML, so please keep me in CC when replying)\r
+\r
+Disclaimer: I never used notmuch - so my questions might appear dumb.\r
+\r
+So I'm developing this personal information management (PIM) suite[0]\r
+and one aspect of PIM clearly is communication a la mail.\r
+\r
+I wonder how notmuch tracks mails. Lets assume that we have a big\r
+Maildir tree - mails move around all the time - how does notmuch\r
+(re)find them? Is there a unique way to identify an email? As far as I\r
+know isn't the message id one of them, right?\r
+\r
+[0]: https://github.com/matthiasbeyer/imag\r
+\r
+--=20\r
+Mit freundlichen Gr=FC=DFen,\r
+Kind regards,\r
+Matthias Beyer\r
+\r
+Proudly sent with mutt.\r
+Happily signed with gnupg.\r
+\r
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