Not exactly on the Open Source side, but the tool is very open source. It pulls all the emails as .eml files
I had managed to break things royally with my hosted domain and spent much of the weekend dragging IMAP folders around till I discovered this little gem.
Links of Note:
- https://webapps.stackexchange.com/questions/347/how-can-i-import-mail-from-one-gmail-account-to-another-preserving-my-label-str
- https://github.com/jay0lee/got-your-back/wiki
The other fun tool of interest is: https://forwardemail.net/#/ This lets you have your own domain and use a regular gmail to read receive them. Ie. foobar@mydomain.com and webmin@mydomain.com all goes to myid@gmail.com.
If you’re hosting your own email, then none of this is really relevant, but thought I’d share since this saved me so much time this weekend.