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Address & domain
Validate address structure, domain existence and mail-routing configuration.
Free · no signup
Check if an email address can receive mail for free.
Verify syntax, domain health, MX records, disposable-email risk, role-account risk and mailbox signals in seconds. No message is sent.
Have a list? Upload a CSV — first 100 free →
Free individual checks. SMTP results can return unknown when a provider intentionally hides mailbox existence.
Likely valid
—deliverability score
Syntax · DNS · MX · disposable risk · role-account risk · SMTP when available
One check, the signals that matter.
We separate hard facts from uncertain mailbox signals instead of hiding everything behind one opaque score.
MX
Mail infrastructure
Inspect active MX records and identify major receiving providers when possible.
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Risk signals
Flag disposable domains, role addresses and mailbox rejection separately.
A free email toolkit.
Useful tools for list hygiene, diagnostics, lead cleanup and pre-send QA.
Email checker
Check address syntax, mail routing and mailbox signals in one place.
Deliverability checker
Inspect SMTP and catch-all signals before you send.
Bulk email verifier
Check up to 100 addresses and export the results.
Disposable email checker
Spot temporary and throwaway email domains.
Email domain checker
Inspect domain existence, mail setup and provider signals.
MX record checker
Find the mail servers responsible for a domain.
Blacklist checker
Check domain and IP blocklist signals, with official removal links.
Email syntax checker
Catch formatting errors before checking the mailbox.
Email extractor
Pull email addresses from text into a clean list.
SPF / DMARC checker
Look up a domain’s sender authentication records.
What does “valid” actually mean?
Email verification has several layers. A correctly formatted address can belong to a nonexistent domain. A domain can exist without mail servers. A mail server can accept all addresses, or deliberately hide whether a mailbox exists. EmailValidly reports those layers separately so an uncertain SMTP result is not presented as a fact.
Does EmailValidly send an email?
No. The single-address checker can make a lightweight SMTP conversation with the receiving mail server, but it does not send a message. Many providers restrict this behavior, so mailbox status may remain unknown.
Who handles email for startups?
Explore observed email-provider routes across YC company domains, with industry, country and team-size filters.
Explore provider market share
