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Email Verifier | 13 Verdicts, Spamtrap Detection | $0.15/1k

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Email verification against 150M spamtraps, 70M complainers, 1M spambots and bot clickers, 3,500+ disposable domains monitored daily. 13 verdicts incl. typo and catch-all. From $0.15/1k, unknown results free, 25 free credits daily. Paste emails or a CSV URL. Bring your own SMTPing API key.

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SMTPing Email Verifier: 13 verdicts, from $0.15 per 1,000

Verify and clean email lists before you send. Most verifiers stop at valid, invalid and catch-all. SMTPing also flags spamtraps, complainers, spambots, blacklisted domains and disposables, the addresses that pass a basic SMTP check and still damage your sender reputation.

The Actor is free. Verifications use credits on your SMTPing account.

Why SMTPing

Price. From $0.15 per 1,000 on the 1M pack, $0.38 per 1,000 on 100k. Credits never expire on pay-as-you-go.
Unknown is free. When a server gives no reliable answer, the result is unknown and you are not charged. Duplicates and rejected requests are free too.
Largest risk databases. 150M known spamtraps, 70M complainers, 1M spambots and bot clickers, 3,500+ disposable domains monitored daily.
25 free credits every day on every account, no card required.
Rich verdicts. 13 statuses in 3 groups, each with a recommended action, plus free-provider, role-account and typo flags.
No email is sent. The SMTP conversation stops before any message is transmitted.

How to use

Create a free account at smtping.com and copy your key from Dashboard > API.
Paste the key, then paste your addresses or a public CSV/TXT URL.
Choose which rows to keep and click Start.

From 50 addresses, the Actor submits one bulk job (up to 100,000 per run) and shows live progress.

Verdicts and groups

safe: send

Verdict	Meaning
`valid`	Mailbox exists and accepts mail
`alias`	Privacy alias forwarding to a real mailbox

judgement: decide per campaign

Verdict	Meaning	Recommended action
`catchall`	Domain accepts every address, this mailbox cannot be confirmed	Send to engaged contacts, exclude from cold outreach
`valid_catchall`	Catch-all domain with positive signals for this address	Lower risk than `catchall`
`unknown`	No usable answer (greylisting, timeouts)	Retry in a few hours; not charged

do_not_send: remove

Verdict	Meaning
`invalid`	Mailbox or domain cannot receive mail; will bounce
`spamtrap`	Exists only to catch senders; the most damaging address on a list
`disposable`	Temporary, throwaway address
`blacklisted`	Domain appears on blocklists
`complainer`	History of marking mail as spam
`spambot`	Automated clicker that inflates engagement metrics
`inbox_full`	Mailbox over quota; mail bounces
`typo`	Misspelled domain (gmial.com); correct it or remove

Real example, a 27,850-address B2B list: 150 spamtraps (0.5%), 76 complainers and 24 spambots, none of which a basic valid/invalid check would remove.

Output

One dataset row per address:

{
  "email": "john@example.com",
  "status": "valid",
  "band": "safe",
  "action": "Send",
  "statusDescription": "safe to send",
  "isFreeDomain": false,
  "isRoleBasedDomain": false,
  "isTypos": false,
  "domain": "example.com"
}

The SUMMARY record in the key-value store gives counts per group and per verdict. Export as CSV, JSON or Excel from the Output tab, or connect Make, Zapier or n8n.

Input

Field	Description
SMTPing API key	Required, stored as a secret
Email addresses	One per line; duplicates removed
List URL	Public CSV or TXT; every address found is verified
Rows to keep	`all`, `safe_judgement` or `safe`
Bulk threshold	Size from which one bulk job is used (default 50)

Links

Pricing: https://smtping.com/pricing
API docs and full verdict reference: https://smtping.com/docs
Node, Python and PHP SDKs, MCP server: https://smtping.com/docs
Blog: https://smtpedia.com

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