Free Email Verifier: Verify Any Email Address Instantly

Yes. You can verify individual email addresses with the demo tool - no account required. For bulk verification or API access, sign up for a free account to receive 100 credits, no credit card needed.

SMTP verification opens a connection to the recipient mail server and issues a RCPT TO command to check if the mailbox exists - without sending an actual email. BounceZero goes further by running a 3-probe catch-all test to detect domains that accept all addresses regardless of whether the mailbox exists.

Yes. BounceZero runs three SMTP probes using randomized addresses to fingerprint catch-all behavior. If a domain accepts all addresses, we probe individual addresses against the provider to resolve them; any that stay unresolved are flagged as catch-all rather than mislabelled.

BounceZero maintains behavioral profiles for 200+ mail providers including Gmail, Outlook/Hotmail, Yahoo, and corporate domains. For providers that block SMTP probes (like Gmail), we use domain intelligence, Gravatar lookups, and ML scoring to estimate deliverability with high confidence.

Yes. BounceZero stores only a hashed fingerprint of each verified address for caching purposes. We never sell or share email data with third parties and are fully GDPR compliant. You can request deletion of any stored data at any time.

A syntax-valid address can still bounce if the mailbox does not exist. Deliverable means the mailbox actually accepts mail - confirmed by MX and SMTP checks. BounceZero separates the two so you only send to addresses that will really receive.

The free tool checks one address at a time. For an entire list, bulk validation runs the same 5-stage pipeline on every address at up to 10,000 per minute - $3 per 1,000, with 100 free credits every month.

An email checker - also called an email verifier - is a tool that verifies whether an email address is real and able to receive messages. It checks syntax formatting, DNS/MX records, the mail server's SMTP response, and catch-all behavior - without sending an actual email. BounceZero adds disposable-domain detection and ML scoring for providers that block probes.

Type or paste the address into the verifier above and press Check. BounceZero runs five stages - syntax, domain and MX lookup, an SMTP mailbox probe, a catch-all test, and ML scoring - and returns a real/invalid verdict in seconds.

For most providers, yes. BounceZero's SMTP check contacts the mail server and tests whether the mailbox accepts messages. Dormant Yahoo accounts, deactivated corporate mailboxes, and deleted Gmail accounts return different SMTP signals that our engine interprets into a deliverability verdict. Gmail blocks SMTP probes, so Gmail checks use provider-specific signals and ML.

BounceZero maintains up to 99.8% accuracy in internal testing on SMTP-verifiable addresses using a 5-stage pipeline and 65+ signals, against an industry benchmark of roughly 95%. Gmail suppresses SMTP responses, so Gmail checks rely on provider-specific oracles and an ML model trained on millions of verified outcomes. Catch-all domains are probed individually; any that stay unresolved are flagged as catch-all rather than guessed.

You get 3 free checks per session on this tool without an account. Create a free BounceZero account to get 100 credits per month - no credit card required, and unused credits never expire.

Email validation is the process of verifying that an email address is correctly formatted, has valid DNS and MX records, and that the mailbox actually exists and can receive messages. It goes far beyond a format check - it tests the full delivery chain before you commit to sending.

The terms are used interchangeably, but validation often refers to the full pipeline: format, DNS, MX, SMTP, catch-all, and risk scoring. Verification typically refers specifically to the SMTP handshake step that confirms the mailbox exists. BounceZero performs both as part of its 5-stage pipeline.

A valid email address must: (1) follow RFC 5321 format with no invalid characters, (2) have a domain with live MX records, (3) have a mailbox that accepts messages via SMTP, and (4) not be a catch-all, disposable, or role address. BounceZero checks all four plus ML-based risk scoring across 65+ signals.

Email lists decay at roughly 2-3% per month. For active campaigns, validate before every major send. For stored lists, validate quarterly at minimum. The most effective approach is real-time validation at the point of collection using the BounceZero API - invalid addresses never enter your list.