"Proton Mail" matching MCP connectors:

Mailbox MCPAOAuth

com.mailbox-mcp.mcp

Hosted remote server for a Microsoft 365, Gmail or IMAP mailbox you already own: read, search, draft, reply in thread, forward and file mail. It moves or flags up to 500 messages in one call, and a send leaves exactly one copy in Sent. A calendar is a separate connection, and connecting one adds diary and scheduling tools.

Invite someone to a calendar event by phone number and get their real email back when they accept.

Let your agent into iCloud Mail, calendar and contacts. It gets actions, never your password.

Read, send, organize, watch email on any IMAP mailbox: Gmail, iCloud, OVH, Zoho, Fastmail + CalDAV.