Sulkta-Coop/mail-mcp
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Rust MCP server for Sulkta email (SMTP send + IMAP read). Replaces scripts/kayos_mail.py.
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Cobb Hayes a6e0a234d2 Public-flip audit: scrub Sulkta-internal refs + Browserless IPs + add LICENSE 
Repository URL → git.sulkta.com. Drop Lucy Browserless IPs from tool doc-strings
(replaced with abstract 'sandboxed headless browser' guidance). Drop sibling-repo
cross-references, kayos@/cobb@ mailbox examples in tool descriptions, vault
pointers. Generalize config.example.toml + README to neutral hosts. Add LICENSE
(MIT — Cargo.toml already declared it).

Tests still green. No behavior change.
2026-05-27 11:06:51 -07:00
crates/mail-mcp Public-flip audit: scrub Sulkta-internal refs + Browserless IPs + add LICENSE 2026-05-27 11:06:51 -07:00
.gitignore mail-mcp v0.1 — Rust MCP server for Sulkta email 2026-05-21 06:50:25 -07:00
Cargo.lock final-approval audit fixes: HIGH-1/2/3 2026-05-21 09:22:39 -07:00
Cargo.toml Public-flip audit: scrub Sulkta-internal refs + Browserless IPs + add LICENSE 2026-05-27 11:06:51 -07:00
config.example.toml Public-flip audit: scrub Sulkta-internal refs + Browserless IPs + add LICENSE 2026-05-27 11:06:51 -07:00
LICENSE Public-flip audit: scrub Sulkta-internal refs + Browserless IPs + add LICENSE 2026-05-27 11:06:51 -07:00
README.md Public-flip audit: scrub Sulkta-internal refs + Browserless IPs + add LICENSE 2026-05-27 11:06:51 -07:00

README.md

mail-mcp

Rust MCP server for IMAP/SMTP. SMTP send + IMAP read with RFC-correct headers, multipart/alternative when HTML is included, multipart/mixed for attachments, threading via In-Reply-To / References.

Tools (v0.1)

  • mail_send — account?, to, cc[]?, bcc[]?, subject, body, body_html?, attachments[]?, in_reply_to?, references[]?. Returns {message_id, sent_at}.
  • mail_inbox_list — newest-first listing. account?, since? (YYYY-MM-DD), unread_only?, limit? (default 50, max 500), folder? (default INBOX). Uses BODY.PEEK — does not toggle \Seen.
  • mail_inbox_read — fetch one message by UID. account?, uid, folder?, format? (text | html | raw_eml). Attachment payloads NOT inlined — only {filename, mime_type, size} metadata.

Outbound headers

  • Date — UTC, RFC 5322 (lettre auto)
  • Message-ID — <UUIDv4@<from_addr_domain>> — own-domain, not the container hostname
  • From — name <addr>
  • MIME-Version: 1.0
  • User-Agent: mail-mcp/<version>
  • In-Reply-To + References when threading args present
  • Content-Type correct for body shape (text-only / alternative / mixed)

DKIM-Signature is applied by the relay, not the client.

Build

cargo build --release

Binary at target/release/mail-mcp.

Config

mkdir -p ~/.config/mail-mcp
cp config.example.toml ~/.config/mail-mcp/config.toml
chmod 600 ~/.config/mail-mcp/config.toml

Passwords are never inline. Per account:

  1. read from the env var named in password_env
  2. otherwise from password_file (shell-format KEY=VALUE per line)
  3. hard fail if neither resolves

MCP wiring

{
  "mcpServers": {
    "mail-mcp": {
      "command": "/usr/local/bin/mail-mcp",
      "args": []
    }
  }
}

Logging is stderr-only — stdout is the JSON-RPC transport.

Safety

mail_inbox_read returns attacker-controlled bytes. Do NOT auto-fetch URLs found in inbound mail — web beacons confirm read and links may be phishing. Default deny on every URL; surface as text and wait for explicit per-link authorization. If a fetch is authorized, route through a sandboxed headless browser rather than curl / WebFetch from the production host. Attachment bytes get the same treatment.

License

MIT — see LICENSE.