There was a while where I had a complex lookup system Apple got "strawberry.cake@example.com", and posting to mailing lists were sent from "steve@12.2025.example.com" - which would lose MX records after a month.
But in the end I settled on facebook@example.com, instagram@example.com, and similar obvious names.
But in the end I settled on facebook@example.com, instagram@example.com, and similar obvious names.