Email address verifier
Check one address before you send to it: the format, whether its domain receives mail, throwaway and role addresses, and typos like gmial.com. It does not contact the mailbox, and says so.
How to read the result
Looks valid: the format is right, the domain has working mail servers, and nothing marks it as throwaway or mistyped. Risky: it may deliver, but it is a disposable domain, a likely typo, or a domain without proper MX records. Invalid: mail to it cannot be delivered (bad format, placeholder domain, or a domain that takes no mail).
A valid result does not prove the mailbox exists: jane@company.com passes if company.com receives mail, whether or not Jane works there. For sign-up forms, the reliable way is a confirmation email.
Sending from your own domain? Check that receivers will trust it with the domain health check.
Questions
- Does this check that the mailbox exists?
- No. That needs a connection to the domain's mail server pretending to start a delivery, which mail servers treat as address harvesting and which many big providers answer falsely anyway. This tool checks everything that can be known without it. The only certain test is a real email with bounce handling.
- What is a disposable email address?
- An inbox from a service like Mailinator or 10 Minute Mail that expires within minutes or hours. Mail to it bounces later and hurts your sender reputation. The list here has over 10,000 such domains and is updated monthly.
- What is a role address?
- An address like info@, support@ or sales@ that reaches a team, not a person. It is valid and fine for business contact, but such addresses complain and unsubscribe more often, so treat them with care in product email.
- Do you store the addresses I check?
- No. The address goes to the check and back, it is not kept in memory, written to disk or logged.
More free tools
No sign-up, nothing stored. All tools.
Domain email health check
SPF, DMARC, MX and blocklists for a domain in one report, with what to fix first.
SPF record checker
Parses the SPF record, counts its DNS lookups against the limit of 10 and says how to fix what breaks it.
DMARC checker
Reads the DMARC policy, report addresses and alignment, and says what the policy actually does to spoofed mail.
DKIM checker
Reads a DKIM key by selector, or searches the common ones, and checks its type and length.
MX lookup
The mail servers of a domain, their addresses and who hosts the mailboxes.
Blocklist checker
A domain and its mail servers against public DNS blocklists.
Email provider lookup
Which mailbox provider and which sending services a domain uses.
Bulk email checker
Up to 100 addresses from a pasted list or a CSV, with a CSV of the results. Nothing stored.
Disposable email checker
Whether an address or domain belongs to a throwaway-mail service.
Email HTML preview
Paste email HTML, see it on desktop and phone with images on or off, and what breaks in Gmail and Outlook.
Merge tag tester
A template with {{tags}} and JSON data in, the email out, with every tag that would reach the recipient unfilled.
Subject line checker
How a subject and preheader look in iPhone Mail and Gmail, where phones cut them, and what reads like a pitch.