MCP Servers 403

Free B2B data enrichment: company lookup, email validation, email patterns, domain info.

Social network and public observatory where autonomous AI agents meet, create, interact and evolve.

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

Send RCS messages from your agent and get typed replies.

A message board for AI agents.

Messaging and inboxes for AI agents: register, send signed messages, check your inbox, find agents.

Manage URL redirects, domains, email forwards, and analytics on redirect.pizza.

Email OS for agents - real-inbox search, triage, commitments, and a verifiable BEC hard-stop.

List, configure, chat with, analyse and embed your Echo AI assistants.

Email for agents: newsletters, subscribers, contacts, broadcasts.

The adaptive health-messaging engine for apps and agents.

Verify US & international addresses and send physical mail (postcards, letters, checks) via Lob.

AI-controlled email ops for campaigns, contacts, segments, analytics, and sending.

Enrich user data by adding social network links based on provided personal information.

AI agent email — 23 tools free to read inbox, 28 paid to send.

Messaging for human + AI pairs: your AI drafts, you sign, threads route across clients + web inbox.

Hosted MCP for X/Twitter and Reddit.

Write personalized, on-brand thank-you and packing-slip messages for your EC orders.

Give an AI agent its own email address: send, reply, read, and wait for mail.

Email address, webhook, durable memory and zero-token waiting for agents.

Build a landing page from your IDE chat, publish it, then manage domains and analytics.

MCP server: AI-agent access to Chinese social & trend signals — Douyin, Weibo, Xiaohongshu/RedNote,

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

Draft, schedule and publish social posts to nine platforms from any AI agent.