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> SMTP is push, not polling.

Yes. And if you want to poll, POP is polling, and IMAP has both polling and immediate notifications.

Yes, but SMTP is a protocol wherein a system opens a connection to another system and says, hey here's a message.

And if that doesn't succeed for some reason, it reliably queues and retries.

That's a push.

I was not disagreeing, merely providing additional information. I have edited to clarify.