Some time in the last few years email changed to not being able to log in for IMAP without the right DKIM records. But then how do I transfer mail from one server to a new one for the same email address? Do I really have to move the files to an account with an address at another domain name and set that account up in my mail client to copy over old mail? I cold have gone through local storage before migrating my account to the new server. But that doesn't seem like the most seamless approach.