Invalid email addresses damage your sender reputation and increase bounce rates. ValidateTime removes bad contacts before you send — so your campaigns hit the inbox every time.
Every address passes through four checks — from instant syntax validation to live SMTP handshakes — so you get accurate results, not guesses.
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Everything developers, marketers, and growth teams need to know about keeping email lists clean — and why basic checkers fail.
Most free email checkers only validate syntax — they confirm the address has an @ sign and a domain. But john@gmail.com passes every syntax check, even if that inbox was deleted five years ago.
Real email verification requires an SMTP handshake — a live conversation with the mail server asking whether the inbox exists right now. That's the only way to catch deleted accounts and full mailboxes before you send.
Every bounced email signals to providers like Google and Microsoft that you're sending to unverified lists. When your bounce rate crosses 2%, spam filters start silently blocking your emails.
Cold email campaigns are the highest-risk use case. Prospecting tools often sell outdated or unverified contacts. Running your list through SMTP verification before each campaign keeps your sender score healthy.
Email lists decay at roughly 22% per year. People change jobs, abandon addresses, and switch providers constantly. A list that was clean six months ago may already have hundreds of dead addresses dragging down deliverability.
Best practice: verify your list before every major campaign, and run a full hygiene pass every 90 days on any list with low engagement.
Syntax validation catches format errors instantly. MX record lookup confirms the domain has a working mail server. SMTP RCPT TO probes whether the specific inbox exists.
The fourth layer — bounce loop detection — handles providers like Yahoo and AOL that block RCPT probing entirely. ValidateTime applies all four layers automatically, giving you structured output: valid, invalid, or unknown.