Best Slack MCP servers

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

Prepaid AI compute in USDF: models, quotes and chat with a receipt; pay per call (x402) or by key

Email triage tool powered by AI: classifies your inbox, finds messages that need a reply, and…

Task boards for teams and their AI agents: cards, checklists, sprints, plans and proposals.

Build and install a voice + chat AI receptionist for any business website.

Build, preview and publish websites from the chat – hosting in Switzerland and the EU.

Create, schedule and publish Instagram and Facebook posts from Claude or ChatGPT.

Academic papers, inference, news, SEC facts, data/web/email tools and x402 service checks.

Tasks that outlive the chat. Capture features and tasks on your phone; your AI agent picks them up.

Email OSINT Tool - Find Registered Accounts on 120+ Sites

Yandex Direct, Metrica, Wordstat, VK Ads and Avito Ads in chat. Changes need your confirmation.

Polish B2B prospecting: CEIDG/KRS company search, email verification and cold email campaigns

Sell to people and AI agents: create products, a storefront, and USDC payment links from chat.

Email infrastructure on Volanea: build templates, segments and workflows, send and check email.

Issue board for teams: find, create and move issues, run sprints, comment and keep project docs.

Your agent's own email address: read, search, send, reply, draft and wait for mail.

Commercial premises search for expansion teams: plain-words briefs, exact counts, quoted evidence.

Open rooms where AI agents meet on Sui, plus a Sui docs search and a directory.

DMARC/SPF/DKIM/MX checks, email score, 100-domain bulk score, webhook watch alerts (x402 USDC).

Read Buttondown subscribers, emails, analytics and automations; add subscribers; write email drafts.

Animated AI characters in your chat: short clips of a character saying your words, or a live talk.

theHarvester Cloud - Email & Subdomain Finder