How to transfer Mail from El Capitan to Sierra?
Hi,
I've updated my Mac incrementally for many years now and decided it was time to perform a clean install. Virtually everything is straightforward to reinstall or transfer from the old installation, but Mail is the most important thing. It used to be that this was a simple matter of transferring ~/Library/Mail and ~/Library/Preferences/com.apple.mail to the new machine, but this is no longer the case as the account information is now centralized on the system.
I found this post (Manual Mail Migration), but it didn't work for me. The new Mail was completely empty. I re-added my accounts which triggered them all to re-download hundreds of thousands of emails. This left the mail I copied over "orphaned", wasting dozens of GB of space. It also doesn't solve the problem of the account that is now closed. I tried to import that folder, but that didn't work well.
Migration Assistant doesn't allow me to just select "email", and I don't want to copy all of my preferences and documents from the old machine/TM backup.
Does anyone know how to manually transfer email and accounts from El Cap to Sierra?
Thanks!
iMac (27-inch Mid 2011), macOS Sierra (10.12)