Check Email Deliverability & Disposable Domains

Updated July 2026

Fake and throwaway email signups pollute your funnel and skew your metrics. An AI agent can screen them at the point of entry with one call.

What the check returns

email_deliverability takes a domain or an email address and returns: whether the domain has MX records (can it receive mail at all), its SPF and DMARC policy, whether it is a free consumer provider, whether it is a known disposable/temp-mail domain, and an overall verdict — business_domain, free_consumer_provider, disposable, or cannot_receive_mail.

Example

"Screen this signup email: test@mailinator.com"

returns verdict: disposable — your agent flags it instantly.

Setup

claude mcp add --transport http domain-intel https://domain-intel-mcp.greenfield1775.workers.dev/mcp

Open source (MIT), self-hostable. GitHub.