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Re:Google requiring all ‘G Suite legacy free edition’ users ... by ec109685 on Wednesday January 19, 2022 @07:05PM (#30002342)
Both Microsoft and Yahoo offer the ability to do “imap in”. Could that be used to sync down the email from Google and then you reconfigure your DNS provider to forward email to your Yahoo/Microsoft personal email account and configure that account to send email using your custom domain name.

What is lost in that case?

Re:Google requiring all ‘G Suite legacy free edition’ users ... by jeroenhd on Wednesday January 19, 2022 @07:22PM (#30002490)
IMAP doesn't sync stuff like calendar, contacts, tasks, settings, email filters (not usually, anyway), and many online clients will only download the email headers in bulk, not the contents; those are often lazy-loaded in when you open a message, especially from more than two weeks ago.

A more reliable way to transfer email would be to download all email through POP3 and then copy them over to an IMAP account on the new server.

You can definitely export your account information (in fact, European data portability laws pretty much require Google to provide such a functionality) but importing it may require some custom tooling.

Unless either Google or the receiving party provides an official migration tool, migration is probably a pretty sucky experience. I know it can be done (companies and educational institutions switch between Google and Microsoft all the time) but I'm not sure if there's any good migration path unless you can get in contact with someone from sales.