"Google's email service" matching MCP connectors:

Regex matching, email/URL format validation, and JSON Schema validation.

Ephemeral mailboxes and a mock OAuth IdP for testing email and auth flows — 39 API-driven tools covering mailboxes, mails, attachments, domains, teams, and mock identities.

Ontario ProtocolB

com.ontarioprotocol

Verify x402 endpoints before payment or publish service profiles for agent discovery.

dilli-email-validation-api-serverB

com.dillilabs.deva

An MCP server that provides tools to validate an email address using Dilli Email Validation API.

Free *.pntr.dev dev subdomains — register subdomains, manage DNS and wildcard records, receive email on disposable inboxes, and capture HTTP requests for webhook debugging. OAuth sign-in; free tier.

20+ pay-per-use APIs: image gen, crypto data, email verify, SSL check, web scraping, and more.