@ShadSterling @b0rk

On Linux I used #imapSync for copying all emails and folders from one account to another. My hosting provider had this tool installed but it can run on your machine at home.
It is no longer in the official Debian repositories, I have read that #mailSync can do the same.
I used the following (rest is code):
imapsync \
--logdir ~/logs/imapsync \
--host1 imap.example.com \
--user1 first.user@example.com \
--ssl1 \
--host2 example.org \
--user2 second.user@example.org \
--ssl2 \

PSA: #MAILSPRING / #NYLASMAIL HAS *NOT* GONE OPEN SOURCE

Beware the #openwashing claims of this company about removing the need for a MailspringID and #opensourcing #MailSync. These make it sound like this #email project has gone #FOSS / #opensource, getting many to pay for a subscription for #privacy focused #email. The server though is (and is planned to remain) closed, #proprietary, #centralized and owned by a US corporation (Foundry 376 LLC).

Details:
https://community.getmailspring.com/t/a-free-open-source-future-for-mailspring/484/20

Please boost.