As far as I can tell, the industry as a whole uses either SMTP (ESMTP) or MSA -mail submission agent (a form of SMTP using port 587). You're not going to find an alternative. In order for mail to be delivered so servers around the world, they had to settle on a uniform method of handling mail exchange. And this is the primary method. There are multiple protocols for mail to be handled at the mail server, but delivery is essentially ONLY SMTP.
SMTP - Wikipedia's article on Simple Mail Transfer Protocol
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