Backing up apple mail to transfer to new computer
I am using OS 12.6 (Monterey). I want to back up my Apple Mail and transfer it to my new iMac (September 2024). I would like to include all of the email "inboxes" and folders that I have created over the years. I do not use Time Machine! I will back up the transfer to an external hard drive.
Thank you for any help or suggestions.
iMac 27″, macOS 12.6