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  25 From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>\r
  26 To: Matthias Beyer <mail@beyermatthias.de>, notmuch@notmuchmail.org\r
  27 Subject: Re: How does notmuch track mails?\r
  28 In-Reply-To: <20160809140223.GH3832@yuu>\r
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  55 On Tue 2016-08-09 10:02:23 -0400, Matthias Beyer wrote:\r
  56 \r
  57 > I wonder how notmuch tracks mails. Lets assume that we have a big\r
  58 > Maildir tree - mails move around all the time - how does notmuch\r
  59 > (re)find them? Is there a unique way to identify an email? As far as I\r
  60 > know isn't the message id one of them, right?\r
  61 \r
  62 notmuch uses message-id to identify individual mails.   this is a nice\r
  63 simplification, but it leaves open some potentially problematic\r
  64 situations that we have still never resolved (e.g. matching message-ids\r
  65 on distinct mail, whether via malice or incompetence).\r
  66 \r
  67 notmuch has maildir scanning code that is clever about tracking which\r
  68 parts of various subtrees have changed recently and avoids having to\r
  69 re-scan them if they haven't changed (this does require some cooperation\r
  70 From=20the filesystem -- if you have an absolutely terrible filesystem, i\r
  71 don't know how notmuch would handle the situation).\r
  72 \r
  73         --dkg\r
  74 \r
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