Fastmail MCP Server
Fastmail MCP server enabling AI agents to interact with Fastmail email accounts via the JMAP protocol — reading, sending, searching, and organizing emails, managing folders and contacts, and integrating Fastmail's privacy-focused email service into agent-driven communication workflows.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
HTTPS. Scoped tokens. Privacy-focused email. Community MCP. Sensitive email data.
⚡ Reliability
Best When
A Fastmail user wants AI assistance with email management — using Fastmail's modern JMAP API for more reliable email operations than legacy IMAP.
Avoid When
You use Gmail, Outlook, or another email provider — use the appropriate MCP.
Use Cases
- • Reading and summarizing emails from communication agents
- • Sending emails and replies from automated workflow agents
- • Searching email history from information retrieval agents
- • Organizing emails into folders from inbox management agents
- • Managing contacts in Fastmail from CRM agents
- • Processing newsletters and notifications from filtering agents
Not For
- • Non-Fastmail email providers (use Gmail MCP, Proton MCP, etc.)
- • High-volume marketing email sending (Fastmail ToS restrictions)
- • Teams without Fastmail account
Interface
Authentication
Fastmail API token required. Generate from Fastmail Settings → API tokens. Scoped tokens available (Mail, Contacts, Calendar). Token provides JMAP API access.
Pricing
Fastmail subscription required. Relatively affordable email service. JMAP API included with subscription. Community MCP is free.
Agent Metadata
Known Gotchas
- ⚠ JMAP protocol knowledge is less common than IMAP — community support smaller
- ⚠ Fastmail subscription required — minor cost barrier
- ⚠ Community MCP from individual contributor — limited documentation
- ⚠ Scoped API tokens recommended — don't use full-access tokens
- ⚠ Email content is highly sensitive — implement appropriate privacy controls
- ⚠ JMAP pagination differs from IMAP — cursor-based
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Fastmail MCP Server.
Scores are editorial opinions as of 2026-03-06.