Quoting Sami Ketola <sami.ketola@dovecot.fi>:
On 4 Sep 2018, at 18.45, Rick Romero <rick@havokmon.com> wrote:
https://imapsync.lamiral.info/FAQ.d/FAQ.Duplicates.txtSeems to use UIDs so that 'data' isn't lost.
No it does not. This is different thing. This is about managing
duplicates on multiple syncs. Imapsync seems to keep track of UID
-> MAIL mapping for server A and UID -> MAIL mapping for server B so
that on multiple runs it does not sync the same messages again.
However it does not use the same UID -> MAIL for server B as is
originally on server A. And that is the problem.
That's not what you said, you said there was a client sync issue.
That's definitely an issue (especially if you run Mac Mail).
Ignoring duplicates on multiples runs is a non-issue, even with the
2011 version. Recording UIDs is not necessary for that.
Rick