Ive got a computer running Mac Mail on OSX 10.12.
For one of my email accounts which is hosted with Google Apps For Business (Gmail) i have recently changed the email address from
email@example.com. These are not separate email accounts, but rather the same account with its name changed and still retains all its emails dating back 4 years.
How can i update Mac Mail to interact with the new email address without having to setup a new email address in Mac mail for
firstname.lastname@example.org which would have to re download all the old emails ?