"An overview of temporal knowledge graphs" matching MCP connectors:

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?"

AIsa Agent MailAOAuth

one.aisa

Your agent needs a mailbox of its own — to receive, thread, draft and send, with attachments, without borrowing your personal inbox or your company's SMTP. **What you can ask for** • "Create an inbox for this agent and tell me its address." • "Read the new messages in this thread and draft a reply." • "Send this message with the attachment and wait for the response." • "Search this inbox for everything from that domain." • "Show delivery metrics and the events on this inbox." **How to use it** Point any MCP client at https://mcp.aisa.one/mail/mcp and sign in with OAuth — there is no key to create or paste. 49 tools: create and delete inboxes, list and read messages, raw message bodies, attachments, threads, drafts and draft attachments, send and reply, message search, inbox events, metrics, and list entries — reads and writes. **Why this rather than the source** A real inbox an agent owns, rather than an SMTP credential it borrows from a human. **It is also a door to the rest** The same login reaches 26 sources and 580+ operations. Find the contact elsewhere in the catalogue, then write to them from here — without adding a second server. **What it costs** Finding and inspecting an operation is free. Running one is billed per call at API prices, with no seat and no monthly minimum, and every call takes max_price_usd so an agent cannot overspend by accident. **Where else it reaches** https://mcp.aisa.one/sales/mcp finds the person to write to.

Crevio's MCP server lets an agent run a real online business, not just read from one. It exposes a delegation surface (ask_crevio, start_task, wait_for_run, send_message, resolve_approvals) plus code_search and code_execute for calling the full Crevio REST API - products, customers, orders, email, socials, and sites.

Give your AI agent an identity it owns: email inbox, US phone number, SMS, voice, and a vault.

7 outreach, sequencing, call-coaching and CRM-hygiene skill products. 6 of 8 free.

Disposable email for agents: create an inbox, wait for the message, read the code. No key needed.

Test an email before it goes out: a disposable address, 41 checks with RFC citations, a fix plan.

Run cold email outbound from an AI agent: campaigns, leads, replies, sender accounts, autopilot.

An AI agent that runs your online business: products, orders, customers, email, and sites.

Test-inbox API for email and SMS: create inboxes, long-poll messages, extract OTPs and links. 34 tools; bearer auth with an mfx_ API key (free tier).

Open-source MCP server that gives AI agents access to real email and calendar in one npm install. Solves the problem of AI agents hitting a wall when they need your inbox.

Gives an AI agent its own email address: create mailboxes, send and reply, read the inbox, and block until a reply arrives. Includes a draft lifecycle so a human can approve outbound mail before it sends.

Dead Simple EmailAOAuth

email.deadsimple

Give an agent its own inbox: send, receive, and pull signup codes from real email.

Manage email campaigns, contacts and deliverability analytics in RuSender from an AI assistant.

Check whether an email address can receive mail — one address or a list — without sending to it.

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

Company email for Rwanda. Read and send mail from a Shaka mailbox over OAuth or an API key.

Giggal.ai is an email verification tool that runs a deep mailbox existence check on every address and verifies catch-all/accept-all and even SEG protected emails. Your bounce rate stays under 5%, and the 30% of every B2B list that other tools flag as "Risky" becomes deliverable again.

InboxPolicy is an MCP email-verification server for agents. Get an actionable verdict: send, send_with_caution, review, retry_later, or avoid, with confidence and SMTP evidence, plus tools for detailed verification, asynchronous batches, and usage tracking

A real phone number and email for your AI Chief of Staff. Calls, bookings by phone, summaries.