"National Rail" matching MCP connectors:
GET /v1/connectors – MCP directory API referenceMatching Connector Tools:
Gmail, Outlook, Hotmail, Microsoft 365, iCloud, Fastmail, other IMAP mailboxes: search, read, send.
Mail one-off USPS letters from ChatGPT or Claude after you approve the preview and price. US only.
Search and triage all your mailboxes; draft replies and campaigns; send only as you allow.
Send a USPS Certified Mail letter to any US address from ChatGPT, Claude or Grok. The assistant prepares the letter and hands back a review link; a person reads it, checks the recipient, pays and authorizes. Nothing is printed, mailed or charged without that approval. $16.17 with the electronic return receipt, $13.18 without. No subscription, and no account needed to see a price. Docs: https://piloxa.com/send-a-certified-letter-online
Over 200 free UK-focused calculators, converters and generators as MCP tools: take-home pay and National Insurance for 2026/27, VAT, stamp duty, mortgages, loans, savings, inflation since 1988, currency with live rates, dates and working days with bank holidays, unit conversions, health calculators, colour and text utilities, encoding, hashing, JWT and TOTP, and validators for IBANs and Bitcoin and Ethereum addresses. Every tool is read-only, stateless and computes on the spot; nothing you send is stored. Each result links to its source page on hopi.co.uk.
Mail merge from Excel or CSV to PDF, right in the chat.
Search, read and draft email across Gmail, Outlook, Yahoo and work accounts in one Kaliham inbox.
Read, search, organize, draft and send business email from your SuperMailOS mailboxes.
Your own AI reads, searches and drafts in your mailbox, on your Windows computer.
Agent-Native Superhuman - email client with keyboard shortcuts and AI triage
