"Exploring the structure of a project" matching MCP connectors:

Emailable MCP — wraps the Emailable email verification API (emailable.com)

Hunter.io MCP — wraps the Hunter.io email finder & verification API (hunter.io)

Klaviyo MCP Pack — wraps the Klaviyo API for email marketing

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

Check email deliverability for a domain: MX, SPF, DKIM, DMARC, blacklists. Graded, no key.

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

Scan and fix a domain's email deliverability (SPF, DKIM, DMARC, MTA-STS, BIMI, DNS blocklists).

Email marketing y transaccional AI-native: campañas, correos 1-a-1, contactos, flujos y métricas.

AI-powered virtual assistant that connects to Gmail, Outlook, Slack, Salesforce, HubSpot, Google Calendar, DocuSign, QuickBooks, and 20+ other services. Manage your entire professional life through a single Claude conversation — email, calendar, CRM, documents, travel, expenses, and more.

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.

Apollo connects your sales data and outreach tools directly to your agent . Ask it to find leads, look up a company, write and send emails, or check how a campaign is performing. All from a conversation, without opening another tab.

Your AI agent just got a marketing team. SendPulse MCP Server provides full access to the SendPulse marketing platform — email campaigns, CRM, chatbots, SMTP, and online courses. 134 methods across 5 modules.

Heldly reads your Google Calendar directly, places tentative holds on every host's calendar, and emails the invitee a one-click picker. The moment the invitee picks, Heldly confirms the chosen slot and deletes the siblings across every host's calendar in the same request. No reusable booking page, no in-app form, no calendar cleanup.

Permissioned access to Outlook, OneDrive and Teams via the user's own Microsoft account

Permissioned access to Gmail, Drive and Calendar via the user's own Google account

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

Give an AI agent its own inbox — receive email as a webhook, send over a verified domain.

Email for AI agents — send, receive as a webhook, manage domains, templates, routing.

Turn inbound email into a webhook — verify, parse, route, and store incoming messages.

Send transactional email over a verified domain — templates, attachments, custom headers.