"How to send a message on Slack" matching MCP connectors:

Teaches AI to write HTML email that renders in Outlook, Gmail, and Apple Mail. 19 rules, 6 comps.

MCP server for Tomba email finder, verification, and contact enrichment API

Emailable MCP — wraps the Emailable email verification API (emailable.com)

send-that-email MCP — wraps StupidAPIs (requires X-API-Key)

Hunter.io MCP — wraps the Hunter.io email finder & verification API (hunter.io)

Findymail MCP — B2B email finder & reverse-email lookup (findymail.com)

Klaviyo MCP Pack — wraps the Klaviyo API for email marketing

could-have-been-email MCP — wraps StupidAPIs (requires X-API-Key)

Mailchimp MCP Pack — manage audiences, campaigns, and members via Mailchimp Marketing API.

Gmail MCP Pack

ActiveCampaign MCP Pack — email marketing + CRM (API v3).

Give an agent its own inbox: send, receive, and pull signup codes from real email.

Postmark MCP.

AI-powered email outreach platform — manage contacts, campaigns, sequences, and send follow-ups with deliverability tracking

AI-powered email outreach platform — send campaigns with deliverability tracking.

Manage lists, contacts and campaigns, and read campaign performance reports on EmailOctopus.

Read email/chat conversations, messages, contacts and teams; draft, send and update threads.

MCP server for Nylas — read email, calendars, events and contacts, and send email or create events.

Email for AI agents: send mail, manage contacts, automations & webhooks. Zero-DNS first send.

Check email deliverability for a domain: MX, SPF, DKIM, DMARC, blacklists. Graded, no key.