How SMTP Email Verification Works
See how SMTP recipient probes use RCPT TO, interpret 2xx, 4xx, and 5xx replies, detect catch-all domains, and preserve unknown results.
Tag: SMTP
Catch-All Email Domains: What They Mean for Verification
Learn how catch-all email detection works, why accept-all domains cannot confirm one mailbox, and how to handle the result without false certainty.
What Is Email Verification? A Practical Developer Guide
Learn how email verification checks syntax, mail routing, provider risk, SMTP responses, and catch-all domains, plus what each result really means.
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