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+ Sun, 27 Apr 2014 12:33:10 -0700 (PDT)\r
+From: Sam Halliday <sam.halliday@gmail.com>\r
+To: David Mazieres expires 2014-07-26 PDT\r
+ <mazieres-8f7y82i34322d6mb5jb2bxwsmw@temporary-address.scs.stanford.edu>,\r
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+Subject: Re: github mirror\r
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+Date: Sun, 27 Apr 2014 20:33:33 +0100\r
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+--=-=-=\r
+Content-Type: text/plain\r
+\r
+David Mazieres <dm-list-email-notmuch@scs.stanford.edu> writes:\r
+> Sam Halliday <sam.halliday@gmail.com> writes:\r
+>> But in any case, my RFE/question was this: how hard would it be to have\r
+>> an optional mode of behaviour where tags are stored in the message\r
+>> itself, so that syncing with an IMAP server (e.g. via offlineimap)\r
+>> would make the tags available on all devices. This would negate the need\r
+>> for workarounds, such as shared notmuch databases, when users have\r
+>> multiple machines.\r
+>\r
+> The problem is that different imap servers store tags in different\r
+> ways. Since notmuch does not use imap, it would be hard for notmuch to\r
+> synchronize the tags, other than the standard ones (for which notmuch\r
+> already has support).\r
+>\r
+> One thing you could do is build an external tool that synchronizes\r
+> notmuch tags and spawns an imap server in preauth mode to sync the tags.\r
+> (That would be yet another use for the ctime values we have discussed on\r
+> this list.)\r
+\r
+The improvements to offlineimap to use the mail header hack might work\r
+well for both of us. Currently the only way to add/remove "labels" (a\r
+gmail concept) is to copy/move mail between folders. And this is how\r
+notmuch "tags" are synced. But with outstanding pull request, this can\r
+all be managed via email headers and that means you *only* need to\r
+synchronise your "All Mail" folder.\r
+\r
+So, I'd be interested to see what your code could do in that world :-)\r
+\r
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