Features
Seven checks on every address, 99.5% accuracy and a clear reason behind every result. Every feature is included on every plan.
100 free credits · No card required
The verification pipeline
Every address runs through syntax, DNS and MX, disposable and role screening, catch-all analysis and a live SMTP handshake. Results we cannot confirm are returned as unknown and never charged.
RFC-compliant format, typo detection and internationalised domains.
The domain exists and resolves.
The domain is set up to receive mail.
Throwaway domains and shared inboxes such as info@ and sales@.
Accept-all servers get a verdict: send safe, send with caution or avoid.
A live handshake confirms the mailbox exists, without sending an email.
Spam-trap patterns, toxic and do-not-mail addresses, and a 0 to 100 score.
No email is ever sent
Typically under half a second on the API, or 1 to 3 seconds when a live SMTP check is needed.
Results
Every result has one of four statuses to act on, a sub-status that explains it and a 0 to 100 score. Catch-all addresses also get a send recommendation.
Deliverable
status: "deliverable"
The mailbox exists and accepts mail. Safe to send.
Risky
status: "risky"
Accept-all domains, role addresses or low-quality signals. Send with care.
Undeliverable
status: "undeliverable"
The address will bounce: no mailbox, a dead domain, bad syntax or a disposable domain.
Unknown
status: "unknown"
The mail server would not give a clear answer. Never charged.
The precise cause, returned as sub_status in the API, webhooks and exports.
Mailbox
mailbox_not_found The mail server says this mailbox does not exist.
account_disabled The mailbox exists but has been disabled.
mailbox_full The mailbox is over quota and may bounce.
alias A plus-addressed alias of a real mailbox.
Address and domain
does_not_accept_mail The domain is set up not to receive email.
invalid_syntax The address is not correctly formatted.
invalid_domain The domain does not exist.
dns_error The domain’s DNS could not be resolved right now.
possible_typo The domain looks like a typo. See did_you_mean.
Server response
greylisted The server asked for a retry later.
blocked The server refused the check for policy reasons.
smtp_timeout The mail server did not answer in time.
Risk signals
catch_all The domain accepts mail for any address.
role_based A shared inbox such as info@ or sales@.
disposable A temporary, throwaway email domain.
possible_trap Matches spam-trap patterns.
toxic Matches known toxic address patterns.
do_not_mail On your suppression list or a known complainer.
When a domain accepts mail for any address, catch_all_verdict tells you what to do.
Send safe. Strong signals that the mailbox is real.
Send with caution. Mixed signals. Send in small batches.
Avoid. Unlikely to be a real mailbox.
Deep dives
Accept-all domains no longer leave you guessing. Each address gets a 0 to 100 score and a send recommendation.
Learn moreEvery result carries a summary and an evidence trail of the checks behind it, in the dashboard and the API.
Learn moreScheduled list re-verification and SPF, DKIM, DMARC and blacklist checks that alert you when something slips.
Learn moreAn MCP server and a CLI so AI assistants, coding agents and pipelines can verify emails on their own.
Learn moreBuilt in
The tools teams need to keep lists clean over time, wire results into their stack and stay in control of spend.
Get notified instead of polling. Subscribe to job completion and failure, low or depleted credits, single verifications and monitor alerts.
Keep addresses you must not mail out of every send. Bounces and complaints from your connected email platforms flow in automatically, and you can upload your own.
Bring your whole team into one organization. Share a single pool of credits and create organization API keys that spend from it.
Re-verify a saved list on a daily or weekly schedule, and check a sending domain’s SPF, DKIM, DMARC and blacklist status. Get alerted when anything regresses.
Download any job as a CSV with status, sub-status, score and the rest of the result. Switching providers? The API can export in your previous provider’s column layout, so existing spreadsheets and import rules keep working.
Give each key exactly the access it needs. Set a monthly credit spend cap, an expiry date and an IP allowlist, and build against sandbox keys for free.
Products
Every product runs the same checks and draws from the same balance of credits.
FAQ
Every address goes through 7 checks: syntax, domain and DNS, MX records, disposable and role screening, catch-all analysis, a live SMTP mailbox check and risk signals such as spam-trap patterns. The SMTP check talks to the mail server without ever sending an email.
RocketVerifier verifies with 99.5% accuracy. When a mail server will not give a clear answer, the result is unknown and you are not charged. Connect your sending platform and every hard bounce on an address we marked deliverable is refunded automatically.
Yes. The API, bulk verification, RocketShield, integrations, webhooks, monitors, team accounts and API key controls are available on every plan. You only pay for verifications.
The sub-status is the precise reason behind a result, such as mailbox_not_found, catch_all, role_based or greylisted. It appears in the dashboard, the API, webhooks and CSV exports, so you can filter and act on the exact cause.
Upload a list or call the API and get a clear result, with the reason behind it, for every address.
100 free credits · No card required · Credits never expire