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1. Terret+(OP)[view] [source] 2026-02-03 18:53:34
I love imapsync:

https://imapsync.lamiral.info

This is the way projects used to be, and surprisingly excellent ones still are.

The amount of knowledge built into this is incredible:

https://imapsync.lamiral.info/S/news.shtml

// imapsync did 14M to 21M mailboxes transfers per month in 2024, or 0.22% of ALL email traffic

replies(2): >>EvanAn+Hm >>171862+ao
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2. EvanAn+Hm[view] [source] 2026-02-03 20:32:42
>>Terret+(OP)
I haven't had excuse to use imapsync for awhile. I remember using it fondly in the past. I definitely hadn't looked at the site in years.

I see that there's a free (for up to 3GB, pay for more) migration service offered there now, too: https://imapsync.lamiral.info/X/

That's a pretty cool way to support the project.

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3. 171862+ao[view] [source] 2026-02-03 20:40:20
>>Terret+(OP)
imapsync is slower than mbsync[1] (both in startup and per message) and doesn't support bidirectional sync[2]. It however handles message identity better than mbsync and supports using different authorization and authentication. For administering our mailserver, I first used imapsync and then patched mbsync to support the Auth header. I still use imapsync to sync the flags afterwards. I think both have high-level race conditions, so maybe take the server offline during a sync.

    [1] https://isync.sourceforge.net/
    [2] https://imapsync.lamiral.info/FAQ.d/FAQ.Two_Ways_Sync.txt
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