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An SMTP handshake proves one thing, and it is not what most lead tools imply

This story is from 2026-09-18. It is preserved in the archive; the latest stories are on the live feed.

Every "email verification" feature I have integrated does the same thing under the hood: it opens a connection to the recipient's mail server and asks about a specific mailbox. That is the entire mechanism. The interesting part is not the protocol — it is what the answer does and does not mean, and…

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  1. 2026-09-18 10:45 · DEV Community — AI
    An SMTP handshake proves one thing, and it is not what most lead tools imply

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