Recipient risk
Invalid, disposable, role-based, or typo'd recipient addresses and domains that cannot receive mail.
Free cold email checker: should this email be sent?
Paste an email your team or AI agent is about to send. SendGuard returns allow, requires approval, delay, or block, with the reasons and what to change.
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.
Sender authentication
Whether your sending domain has SPF, DKIM, and DMARC, which Gmail and Yahoo require from bulk senders.
Message risk
Unsupported claims, pressure language, and sensitive topics that should go to a human before sending.
FAQ
Common questions
What does the cold email checker look at?
The recipient address and domain, your sending domain's SPF, DKIM, and DMARC, and the subject and body for risky claims, pressure language, and sensitive topics. It returns the same decision the SendGuard preflight API returns.
Is my email stored or sent?
Nothing is sent. The check runs the SendGuard preflight engine once and returns a decision; SendGuard never sends email itself. Do not paste confidential information you would not put in a support ticket.
Can my AI agent run this check automatically?
Yes. Connect the SendGuard MCP server at https://api.sendguard.ai/mcp or call the preflight API before each send. The $1 Pilot includes 100 API checks.
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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