Deliverability verdicts
Return deliverable, risky, undeliverable, or unknown states with reason codes your workflow can act on.
Email validation API built for AI outbound.
Validate addresses, detect disposable mailboxes, understand deliverability risk, and protect sender reputation before autonomous agents send email.
What it does
SendGuard checks syntax, DNS, MX, provider behavior, disposable domains, role accounts, catch-all signals, and SMTP response patterns so agents do not waste sends on risky recipients.
AI SDR systemsgrowth engineering teamscold email platformssales operations
Best fit
- One API response includes deliverability, confidence, reason codes, and billing status.
- Designed for pre-send checks rather than after-the-fact list cleanup only.
- Works as a standalone verification endpoint or inside the preflight firewall.
Capabilities
Signals your workflow can act on.
Each page targets a clear long-tail query while staying tied to the actual SendGuard API surface.
Provider-aware probing
Use cautious SMTP strategy and provider heuristics instead of treating every mailbox host the same.
Billing-safe responses
Syntax errors, cache hits, unknown outcomes, and system errors are not charged as full verification checks.
FAQ
Common questions
Is SendGuard only an email verification API?
No. Email validation is one layer. SendGuard also scores outbound message risk, applies policy, and can require human approval before sending.
Does SendGuard charge for every request?
No. Only checks that return a definitive billable result consume credits. Cache hits, syntax errors, unknown results, and system errors are free.
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