Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Protonmail Mcp Server

A Model Context Protocol server that lets Claude (or any MCP client) read, search, organise, draft and send email through a locally running ProtonMail Bridge.

Compatibility: Not stated.

Grade C

One Medium finding. Read the report before installing.

Graded by PlugVetRubric v2

Not a guarantee. A hygiene check of the source at the commit shown, not a security audit.

SECRETS_PATH_CREDENTIAL

Why this grade

  • SECRETS_PATH_CREDENTIAL Medium

    Mentions a credential store path (~/.ssh, id_rsa, .npmrc, .aws/credentials, credentials.json, .netrc).

    src/protonmail_mcp/attachments.py, line 23 ut att innehålla hemligheter (nycklar, .env, .netrc, nyckelringar) skickas

Any High, or two or more Medium findings, give D. One Medium gives C. Low findings or a security Note give B. Each code names a finding behind the letter.

Grades are a hygiene check of the source at the commit shown, on the date checked, not a security audit or a guarantee. The free directory grades are automated. Before release, a PlugVet engineer reviews every paid report and any grade we hold back, including all F grades, against the source code and the evidence we quote.

What was checked

Plain notes from the hygiene checks.

  • Permissions

    Pass

    No shell or command execution found, and no extra permission was declared.

  • Install and update

    Pass

    No install-time script found, and dependencies are pinned or absent.

  • Network

    Concern

    can reach a host that is not written as a fixed address.

    NETWORK_NO_FIXED_HOST

    src/protonmail_mcp/imap_client.py, line 553

    fetch_resp = await self._client.fetch(f"{start}:{stop}", _METADATA_ITEMS)

    src/protonmail_mcp/imap_client.py, line 741

    fetch_resp = await self._client.fetch(

    src/protonmail_mcp/imap_drafts.py, line 71

    resp = await imap._client.fetch(",".join(seqnums), "(UID)")

    Show more

    src/protonmail_mcp/imap_labels.py, line 279

    resp = await imap._client.fetch(",".join(chunk), _IDENTITY_ITEMS)

    src/protonmail_mcp/imap_threads.py, line 139

    resp = await imap._client.fetch(

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_CREDENTIAL SECRETS_PATH_DOTENV

    CLAUDE.md, line 12

    cp .env.example .env # PROTONMAIL_USERNAME + Bridge-lösenordet

    src/protonmail_mcp/attachments.py, line 23

    ut att innehålla hemligheter (nycklar, .env, .netrc, nyckelringar) skickas

    src/protonmail_mcp/attachments.py, line 143

    _SENSITIVE_NAMES = frozenset({".ssh", ".gnupg", ".aws", ".netrc", ".env"})

    Show more

    src/protonmail_mcp/attachments.py, line 161

    id_* räknas bara utan filändelse eller med .pub (id_rsa, id_ed25519,

    src/protonmail_mcp/attachments.py, line 165

    if low in _SENSITIVE_NAMES or low.startswith(".env.") or "keychain" in low:

    src/protonmail_mcp/attachments.py, line 425

    """Namnet är känsligt bara för ändelsen .key (inte t.ex. id_rsa.key)."""

    src/protonmail_mcp/config.py, line 10

    # <repo>/src/protonmail_mcp/config.py → <repo>/.env. Läses även när servern

    src/protonmail_mcp/config.py, line 12

    PROJECT_ENV_FILE = Path(__file__).resolve().parents[2] / ".env"

  • Agent instructions

    Pass

    No instruction to ignore earlier instructions or to hide a step.

  • Obfuscation

    Pass

    No encoded or minified payload found.

  • Licence

    Pass

    A licence file is present (LICENSE).

  • Maintainer activity

    Pass

    The latest commit is within the last 365 days.

Get the full report on this tool, £49

Note

Hygiene check of commit 5b0fce0fa593. can reach a host that is not written as a fixed address. reads a credential or environment file.

Date and source

Date checked:

View source

github.com

Commit graded: 5b0fce0fa593dbb07a45380bdfa8a3318b6a5690

This link goes to the original host. PlugVet does not host or check what you download from there, and installing it is your own decision and risk.

Read how this letter is chosen