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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.

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.

Email migration is genuinely painful and I am sure there's a real market here, so I am not trying to discourage you. But why should I trust a third party with my IMAP credentials?

"Credentials encrypted in memory only and deleted immediately after migration".

I have no way to audit/verify this claim. You're essentially asking users to hand over the keys to their entire email history on faith.

I am in the process of migrating from GMail and Proton using imapsync, since Proton's built-in tool imported some 95% of emails only.

Turns out Proton is super picky about RFC compliance and will reject anything that doesn't met the criteria, which sucks because GMail does exactly the opposite and will take almost anything you throw at it.

So I have so far written about 7 different regexes to fix some specific mailer issues to make them RFC compliant, with plenty more to go. And even then it still somewhat sucks because I am, effectively, modifying the emails to a state they were not received/sent in.

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).

What is the advantage of this tool over, you know, just using Thunderbird or another MUA to copy your emails to the new mailbox?