This is a pet peeve. SMTP goes to insane lengths to ensure that messages are never lost, but spam filters have broken those guarantees. I don't manage my own

This is a pet peeve. SMTP goes to insane lengths to ensure that messages are never lost, but spam filters have broken those guarantees. I don't manage my own SMTP server, but my mail is hosted on a personal domain not backed by GMail, and I can never be sure if it has been delivered.