Address and domain
Syntax, whether the domain exists, its MX records and mail provider, and parked domains that cannot receive mail.
Free email verifier: is this address safe to send to?
Enter one email address. SendGuard checks the syntax, the domain and its MX records, disposable and role-based patterns, and likely typos, then tells you whether to send.
20 free checks per day, shared across SendGuard tools. Nothing is sent and no SMTP session is opened.
How it works
What this check covers.
Risky address types
Disposable inboxes, role accounts like info@ or sales@, free webmail, and very new domains.
Typos
Common domain typos such as gmial.com, with a suggested correction.
FAQ
Common questions
Does this tool send an email or contact the mailbox?
No. The free verifier checks syntax, the domain, MX records, disposable and role-based patterns, and common typos. It never opens an SMTP session and never sends anything, so it cannot confirm that a specific mailbox exists.
How many free checks do I get?
20 checks per day per network, shared across the SendGuard free tools. No account or card is needed.
What is the difference between this and the SendGuard API?
The API runs the same checks inside your sending workflow, adds sender, message, and policy context, and returns allow, requires_approval, delay, or block for each email your agent wants to send.
Run this check automatically before your AI agent sends.
The SendGuard preflight API and MCP server return allow, requires_approval, delay, or block for every outbound email. The $1 Pilot includes 100 checks.
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