Email Address Validator
Enter email addresses to validate format, check MX records, and detect disposable/throwaway email domains.
Format and disposable checks run client-side. MX record checks use our servers.
How to use Email Address Validator
The Email Validator checks an address for correct syntax and then verifies that its domain can actually receive mail by confirming MX records exist, helping you catch typos and dead addresses before they cost you. Sending to invalid addresses inflates your bounce rate, which mailbox providers read as a sign of poor list hygiene and use to lower your sender reputation. Use this tool to validate a single address, to clean a small list, or to sanity-check the address a user typed into a sign-up form before you store it and start mailing it.
- Enter the email address you want to validate.
- Click Validate to check syntax and domain records.
- Confirm the local part and domain form a valid address.
- Check that the domain publishes MX records for mail.
- Reject or correct addresses that fail either test.
Your data never leaves your device — 100% private processing.
Syntax, domain and deliverability
Validation happens in layers. Syntax checking confirms the address has a sensible local part, a single @, and a plausible domain — catching the obvious typos like a missing dot or a stray space. Domain checking goes further by confirming the domain exists and publishes MX records, which proves it is at least configured to accept mail. Neither layer can guarantee a specific mailbox exists without sending to it, but together they eliminate the large majority of bad addresses cheaply and without risking your reputation.
| Layer | What it confirms |
|---|---|
| Syntax | The address is well-formed |
| Domain / MX | The domain can receive mail |
| Mailbox | The specific inbox exists (needs SMTP probe) |
Why list hygiene protects deliverability
Mailbox providers judge senders partly on how many messages bounce. A list full of mistyped or abandoned addresses produces hard bounces that signal carelessness, and enough of them can land your mail in spam folders or get it blocked entirely. Validating addresses at the point of capture — on the sign-up form — is the most effective fix, stopping bad data before it enters your system. Periodically re-validating an existing list catches domains that have since gone dark. Clean lists deliver better and cost less to send.
Glossary
- Email validation
- Checking that an address is well-formed and its domain can receive mail.
- MX record
- A DNS record naming the mail servers for a domain.
- Hard bounce
- A permanent delivery failure, often from an invalid address.
- List hygiene
- Keeping a mailing list free of invalid and inactive addresses.
- Local part
- The portion of an email address before the @ sign.
Related reading
Frequently Asked Questions
Get weekly tool tips & updates
New tools, power-user tips, and productivity hacks — delivered free every Friday.
No spam, ever. Unsubscribe with one click.
Why use Email Address Validator?
- Real-time DNS lookups using live resolver queries
- Supports IPv4 and IPv6 addresses
- No software to install — runs entirely in the browser
- Results include TTL values and record priority
Common use cases
- Verify DNS propagation after updating nameservers
- Check MX records when troubleshooting email delivery
- Look up SPF/DKIM/DMARC records for email security audits
- Test whether a SSL certificate is valid and up to date
- Find the IP address behind a domain name
Related Network & DNS
MX Record Lookup
Look up MX (Mail Exchanger) records for any domain. Find which mail servers handle email delivery and check their priority order instantly.
Email Blacklist Check
Check if your IP or domain is blacklisted on major email blocklists (DNSBLs). Diagnose email deliverability issues.
SPF Record Checker
Check the SPF (Sender Policy Framework) record for any domain. Validate your email authentication setup and spot misconfigurations instantly.
DNS Lookup Tool
Look up DNS records for any domain — A, AAAA, MX, NS, TXT, CNAME, SOA, and CAA records. Free, instant results pulled from authoritative nameservers.
DNS Propagation Checker
Check if your DNS changes have propagated worldwide. Test A, MX, and NS records across 8 global DNS servers to confirm updates are live everywhere.
What Is My IP Address?
Instantly find your public IP address. Shows your IPv4 address as seen by websites and servers, plus quick details about your connection.
Explore all Network & DNS.