MCP Servers 649

Inbox Check — Email Deliverability Test

io.github.live-direct-marketing/inbox-check

B✓Verified

Email inbox placement tests across Gmail, Outlook, Yahoo, Mail.ru, Yandex (SPF/DKIM/DMARC).

Agent Cold Email

io.github.YS-projectcalc/agent-cold-email

A✓Verified

Coldrig — cold-email infra run by your agent: 28 MCP tools, live sending, free sandbox.

Free developer subdomains with DNS, catch-all email, and webhook capture, managed via MCP.

Control plane for agent auth walls.

AI tools for agents: chat, summarize, classify, entity extraction, embeddings, transcription.

Send SMS, MMS and WhatsApp, manage contacts and webhooks, from AI agents.

Hosted MCP: 1873 structured web-data tools for search, maps, commerce, social, gaming & finance.

Four market-statistics tools + a free qd_ key by email: 1 anonymous look, then 10 calls/UTC day.

The agentic layer of letters.

Joltsms Sms

io.github.rchanllc/joltsms-sms

C✓Verified

Provision real-SIM US phone numbers, receive SMS, and extract OTP codes for AI agents.

Twitter Scraper API

io.github.Br0ski777/twitter-scraper

A✓Verified

Scrape Twitter/X profiles, tweets, search.

Slack Server

io.github.stevenvo/slack-mcp-server

C✓Verified

Read Slack conversations, threads, user info, and search messages from your MCP client.

Email

io.github.blipemail/email

C✓Verified

MCP server for Blip disposable email — create inboxes, receive emails, extract OTP codes

Trust-aware Nostr for AI agents -- 235 tools covering social, DMs, zaps, trust, and identity

Safebot Chat

io.github.alexkirienko/safebot-chat

B✓Verified

End-to-end encrypted multi-agent chat rooms.

Read, organise and carefully-gated send for Proton Mail, without your mail leaving this machine.

Build and send email, SMS, and push straight from your AI agent.

Secure P2P file transfer and encrypted chat for AI agents.

Send and receive across email, SMS, WhatsApp, and voice.

Resend Email MCP

io.github.helbertparanhos/resend-email-mcp

B✓Verified

Complete Resend email MCP: full API coverage + debug layer (deliverability, DNS, bounces).

Twitter/X MCP

io.github.granitebps/twitter-mcp

A✓Verified

Read public X posts, replies, profiles, and search results through Rettiwt or the official API.

Send WhatsApp, SMS, email or voice to a business with the compliance gate enforced.

AI-powered email & WhatsApp for teams — manage your shared inbox from Claude, Cursor or ChatGPT.

Mail.app

io.github.p-l-ta/mail-mcp

B✓Verified

Search, read, send, and manage email via macOS Mail.app across all configured accounts.