Mailinator - Any Inbox. Any Time.
Magic - Get whatever you want on demand with no hassle, through SMS
Guerrilla Mail - Guerrilla Mail is a web-based app that provides a disposable and anonymous email address. Users of the service are not required to set up an account in order to send or receive emails.
June.ai - A communication hub that replaces email
Spamgourmet - spamgourmet provides email addresses that get created automatically the first time they are used, forward messages, and then automatically expire.
Clarke.ai - AI powered assistant that dials into calls and takes notes