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Migrate Wizard – IMAP Based Email Migration Tool
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

It doesn’t explicitly state anything about the email contents in the privacy policy page. People generally trust their email providers to not snoop in their emails. I wonder why anyone should trust a cloud based service (such as this).
  • bm3
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  • 2 hours ago
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I'm sure the MigrationWiz guys will appreciate your name.

I also can't imagine there is much demand for IMAP only email migration services these days.

  • Terr_
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  • 1 hour ago
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Perhaps not much, but last year I was looking at using IMAP as an export/import path for a relative's old Eudora mails to some much-more-recent client. I insisted on it, after I found out it could no longer make a secure connection to their e-mail server.

That said, I was saved/pleased by Eudora2Unix [0], one of those projects that represents a very long slow burn of successive people with a similar niche struggle. You might think Thunderbird would have an import tool for that, but it's been so many years it didn't survive...

[0] https://github.com/jonabbey/eudora2unix

What is the advantage of this tool over, you know, just using Thunderbird or another MUA to copy your emails to the new mailbox?
You could use Thunderbird, but it’s slow for large mailboxes and multiple accounts. Being cloud-based, Migrate Wizard moves email faster, tracks progress, retries on errors, and supports incremental syncs - all without running a client locally.
Migrate Wizard is a fast, secure IMAP email migration service that helps developers and teams move email data between providers with zero downtime.

It supports large mailboxes, preserves full data integrity, requires no setup, and works with any IMAP-compatible email service.