Email MCP Servers for DeepSeek Harness

Verify emails (valid/invalid/risky/unknown): MX, SMTP, catch-all, disposable. Free agent key.

Email preflight x402: $0.001 USDC on Base. MCP returns unpaid 402 only; no signing or payment.

Cloudflare Workers MCP server: email-validator

Verify email deliverability & find business emails (single or bulk) via the Verifox API.

Verify emails (valid/invalid/risky/unknown): MX, SMTP, catch-all, disposable. Free agent key.

Read and search FranklyMail email and prepare drafts, replies, and forwards for human approval.

Design emails from a brief, send tests, send to your lists now or scheduled, and read delivery.

Inbox placement tests across Gmail, Outlook, Yahoo and 30+ providers.

MCP server for Gmail integration with OAuth2 and service account support

Production IMAP & SMTP for Claude: multi-account email search, triage, send, and spam checks.

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Connect inboxes to your AI, with built-in progress and optional owner-confirmed outgoing email.

An MCP server that validates email addresses on demand

Email management via JMAP — mailboxes, messages, identities, and Sieve scripts

Check whether an email address can receive mail — one address or a list — without sending to it.

Letterkeel: send email from your own domain via SMTP, Resend, SendGrid, Mailgun, Postmark

Letterkeel: send email from your own domain via SMTP, Resend, SendGrid, Mailgun, Postmark

Design emails from a brief, send tests, send to your lists now or scheduled, and read delivery.

Filtered, read-only IMAP and Gmail archived to disk as .eml + markdown, served over MCP.

Read, send, file and search email in any Gmail, Microsoft 365 or IMAP mailbox, plus its calendar.

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