"Gmail" 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.

Test-inbox API for email and SMS: create inboxes, long-poll messages, extract OTPs and links. 34 tools; bearer auth with an mfx_ API key (free tier).

Inbox Placement Test

online.live-direct-marketing.check

Programmatic email deliverability testing for AI agents. Create inbox placement tests across Gmail, Outlook, Yahoo, Mail.ru, Yandex — get per-provider placement (Inbox/Spam/Promotions), SPF/DKIM/DMARC auth, Rspamd & SpamAssassin verdicts, DNS health, and live SSE results.

Disposable test mailboxes on a real domain: send, receive and assert on real email.

Temp MailOAuth

io.temp-mail

Disposable email inboxes for AI agents — read messages and verification codes.