"Collaboration Between Multiple AIs via MCP (Master Control Program)" matching MCP connectors:

Find Robly contacts and lists; subscribe, update and move contacts between lists.

Read, reply to and send email across every domain you connect to Mailyond, via API key over HTTP.

Free hosted MCP server that connects ChatGPT and Claude (claude.ai, Claude Code) to multiple Gmail, Google Calendar, Google Drive (read-only) and Google Contacts accounts, Slack workspaces and Notion through one connection URL. Search, read and act across every connected account at once, with a memory shared across your AI assistants. OAuth sign-in. Outlook / Microsoft 365 are not supported.

Apollo.io B2B Person Enrichment & Verified Work Email Finder via x402 on Base ($0.03, free on miss).

Weekly client reports: change, % change, targets, status, printable page and email text. Free.

Email verification for AI agents: syntax, MX, disposable, role, score. $0.001 USDC/call via x402.

Audit SPF, DKIM, DMARC, MX, BIMI, MTA-STS for a domain; score + grade. $0.003 USDC/call via x402.

Mailvett: validate emails. MX, provider, disposable/role/free flags, typo fix, verdict.

Cold email sequences, leads, templates, senders, inbox, and analytics via the SalesBlink API.

Mailvett: validate emails. MX, provider, disposable/role/free flags, typo fix, verdict.

email-verifierA

ai.verifox

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

Send transactional emails for AI agents via SMTP. Templates included.

Send transactional pdfs for AI agents via SMTP. Templates included.

AgentiSend is a transactional email API: send through verified domains with a message log, budgets, a preflight and refusals that name the fix; built so AI agents can send on your behalf. The hosted MCP server at https://api.agentisend.com/mcp exposes 82 tools (44 on tools/list; the rest via list_more_tools). A send is one message or a batch of up to 500 items with per-item results. preflight_email runs every gate a real send runs, sends nothing, and costs nothing. Every 4xx returns code, message, and fix. There is no tool for unsolicited mail. Auth is a bearer API key or OAuth 2.1 with dynamic client registration. Starter prompts: "Send this receipt to the customer." "Preflight this send and tell me what would stop it." "What can I spend today?"

Give AI agents their own email inboxes: list, read and send mail via scoped, revocable OAuth grants.

AI-powered email client with MCP. Connect Claude, ChatGPT or Cursor to your inbox via OAuth to read, organize and reply to emails.

B2B sales outreach, lead generation and email automation platform via MCP

AI-first cold email outbound engine MCP server. Automate lead research, personalized sequence generation, automated mailbox warmup, and intelligent delivery throttling directly via MCP tools.

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

Check email addresses for syntax, MX and disposable domains. $0.0015/call via x402.