Topic

SMTP

October 11, 2026 · 8 min read
SMTP probing: how to know if an email exists without sending anything
Learn how SMTP checks work without sending a message, what server responses mean and why catch-all domains or temporary blocks can leave results inconclusive.
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September 3, 2026 · 4 min read
Yahoo, AOL and catch-all domains: the limits of email verification
Understand why an accepted SMTP check cannot always confirm a mailbox, how to handle unknown results and what to expect from an email verifier.
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