Users will be able to change their username only once every 12 months. Plus, they won’t be able to delete their new email address for that period of time.
Archived version: https://archive.is/20260331184305/https://techcrunch.com/2026/03/31/google-is-now-letting-users-in-the-us-change-their-gmail-address/
You don’t need to run your own email server to use a custom domain, some email providers let you use your own domain.
Shout out to Purely Mail!