Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Proton Mail Mcp

A local MCP server that lets Codex and Claude Code work with your Proton Mail account through Proton Mail Bridge's local IMAP interface: read mail (V1), triage it as of V2 — mark read/unread, archive, move, mark as spam, apply/remove labels, and

Compatibility: Not stated.

Grade B

Minor issues only, no Medium or High. Worth a quick look at the findings below before installing.

Graded by PlugVetRubric v2

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

NETWORK_NO_FIXED_HOST SECRETS_PATH_DOTENV

Why this grade

  • NETWORK_NO_FIXED_HOST Low

    Makes a network call whose host is not written as a fixed address.

    src/analysis/metadata.ts, line 164 for await (const message of client.fetch(

  • SECRETS_PATH_DOTENV Low

    Mentions a .env file.

    .gitignore, line 12 .env

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/analysis/metadata.ts, line 164

    for await (const message of client.fetch(

    src/mail/messages.ts, line 132

    for await (const message of client.fetch(

    src/mail/messages.ts, line 142

    for await (const message of client.fetch(`${start}:*`, {

    Show more

    src/mail/search.ts, line 53

    for await (const message of client.fetch(

    src/mutations/existence.ts, line 26

    for await (const message of client.fetch([...uids], { uid: true }, { uid: true })) {

    src/mutations/existence.ts, line 56

    for await (const message of client.fetch(

    src/mutations/flags.ts, line 68

    for await (const message of client.fetch([uid], { uid: true, flags: true }, { uid: true })) {

    src/mutations/labels.ts, line 37

    for await (const message of client.fetch(

  • Secrets

    Concern

    reads a credential or environment file.

    SECRETS_PATH_DOTENV

    .gitignore, line 11

    # Real configuration lives outside this directory, in ~/.config/proton-mail-mcp/

    .gitignore, line 12

    .env

    .gitignore, line 14

    !.env.example

    Show more

    README.md, line 34

    in agent MCP configuration, never in a committed `.env` file, and never printed to a log.

    SECURITY.md, line 19

    Claude Code MCP configuration, and never placed in a committed `.env` file. `.gitignore` also

    SECURITY.md, line 20

    excludes `.env*`, `*.pem`, `*.crt`, `*.key`, `*.p12`, and `*.pfx` as a backstop.

  • 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 7e77e5c52104. 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: 7e77e5c5210400a4519f2b0fef1384a2b469a227

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