Grades are a hygiene check, not a security guarantee.

MCP, MCP server

Mail Task Mcp Server

Self-hosted MCP control plane for email, persistent tasks, project context and AI-assisted workflows.

Compatibility: Not stated.

Grade D

Two or more Medium findings, or a High. Only try it in a sandbox.

Graded by PlugVetRubric v2

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

PERMISSION_SHELL_UNDECLARED NETWORK_HOST_FROM_INPUT OBFUSCATION_MINIFIED_PAYLOAD

Why this grade

  • PERMISSION_SHELL_UNDECLARED Medium

    Runs shell commands that the manifest or description does not mention.

    scripts/prepare_context_model.py, line 60 shutil.rmtree(staged, ignore_errors=True)

  • NETWORK_HOST_FROM_INPUT Medium

    A file takes a URL or endpoint as input and has no fixed host list.

    extras/cloudflare-email-privacy-proxy/src/index.js, line 77 const checked = await guard.fetch("https://nonce-guard/check", {

  • OBFUSCATION_MINIFIED_PAYLOAD Medium

    Contains a very long line with almost no spaces in a script or style file.

    src/postmaster/webgui_mail_files_v971.py, line 18 .v971-floating-compose{position:fixed;right:24px;bottom:24px;z-index:1200;width:min(720px,calc(100vw - 48px));max-height:min(82vh,820px);overflow:auto;box-shadow:0 18px 60px rgba(0

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.

If you think this grade is wrong, email [email protected] with the entry link and your evidence. We aim to acknowledge within two working days and decide within seven. If we confirm an error, we aim to correct it within 24 hours of confirming it. These are aims, not guarantees.

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

    Concern

    can delete files. requests shell access. No manifest field names shell or command execution.

    PERMISSION_SHELL_UNDECLARED PERMISSION_DELETE_FILES

    scripts/prepare_context_model.py, line 60

    shutil.rmtree(staged, ignore_errors=True)

    scripts/prepare_context_model.py, line 63

    shutil.rmtree(backup, ignore_errors=True)

    scripts/prepare_context_model.py, line 71

    shutil.rmtree(backup, ignore_errors=True)

    Show more

    scripts/prepare_context_model.py, line 199

    shutil.rmtree(work_dir, ignore_errors=True)

    .github/workflows/v9-runtime-tests.yml, line 251

    completed = subprocess.run(['/bin/sh', '-c', command], env=env, text=True, capture_output=True)

  • Install and update

    Concern

    dependencies are not pinned.

    INSTALL_UNPINNED

    requirements.txt, line 1

    mcp>=2,<3

  • Network

    Serious

    accepts a host from input, with no fixed list in this file.

    NETWORK_HOST_FROM_INPUT

    extras/cloudflare-email-privacy-proxy/src/index.js, line 77

    const checked = await guard.fetch("https://nonce-guard/check", {

    extras/cloudflare-email-privacy-proxy/src/index.js, line 87

    const response = await guard.fetch("https://nonce-guard/secret-state", { method: "GET" });

    extras/cloudflare-email-privacy-proxy/src/index.js, line 201

    const response = await guard.fetch("https://nonce-guard/secret-state", {

    Show more

    extras/cloudflare-email-privacy-proxy/src/index.js, line 269

    const response = await fetch(endpoint, { headers: { accept: "application/dns-json" }, redirect: "error" });

    extras/cloudflare-email-privacy-proxy/src/index.js, line 372

    const response = await fetch(target, {

    extras/cloudflare-email-privacy-proxy/src/index.js, line 512

    async fetch(request) {

    extras/cloudflare-email-privacy-proxy/src/index.js, line 553

    async fetch(request, env) {

    scripts/prepare_context_model.py, line 84

    with urllib.request.urlopen(request, timeout=90) as response, archive.open("wb") as out:

    src/postmaster/email_privacy_v963.py, line 578

    return httpx.post(

  • Secrets

    Note

    reads an environment variable.

    SECRETS_ENV_READ

    src/postmaster/account_store.py, line 49

    self.key_path = key_path or os.getenv("MAIL_ACCOUNTS_KEY_PATH", "/data/mail_accounts.key")

    src/postmaster/account_store.py, line 178

    password = os.getenv("MAIL_PASSWORD", "")

    src/postmaster/email_analytics.py, line 183

    self.key_path = key_path or os.getenv("EMAIL_ANALYTICS_KEY_PATH", "/data/email_analytics.key")

    Show more

    src/postmaster/email_privacy_v963.py, line 323

    self.key_path = key_path or os.getenv("PRIVACY_PROXY_KEY_PATH", "/data/privacy_proxy.key")

    src/postmaster/file_handoff.py, line 79

    configured = os.getenv("FILE_STORE_DOWNLOAD_SECRET", "").strip()

    src/postmaster/mail_bridge.py, line 59

    password = os.getenv("MAIL_PASSWORD", "")

    src/postmaster/unsubscribe.py, line 42

    self.key_path = Path(key_path or os.getenv("UNSUBSCRIBE_KEY_PATH", "/data/unsubscribe.key"))

  • Agent instructions

    Pass

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

  • Obfuscation

    Concern

    contains a minified payload.

    OBFUSCATION_MINIFIED_PAYLOAD

    src/postmaster/webgui_mail_files_v971.py, line 18

    .v971-floating-compose{position:fixed;right:24px;bottom:24px;z-index:1200;width:min(720px,calc(100vw - 48px));max-height:min(82vh,820px);overflow:auto;box-shadow:0 18px 60px rgba(0

    src/postmaster/webgui_mail_safety_v971.py, line 9

    .v971-mail-safety{margin:0 0 14px}.v971-mail-safety-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;flex-wrap:wrap}.v971-mail-safety-head h2{margin:

    src/postmaster/webgui_projects_ux_v971.py, line 11

    .v971-active-project{display:flex;align-items:center;gap:8px;margin:8px 0;padding:8px 10px;border:1px solid var(--line);border-radius:9px;background:color-mix(in srgb,var(--accent)

    Show more

    src/postmaster/webgui_v960.py, line 28

    .v960-inline-detail td{padding:0!important}.v960-detail-shell{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:14px;background:rgba(127,127,127,.035)}.v

    src/postmaster/webgui_v960.py, line 31

    .v960-scope-chips{display:flex;gap:7px;flex-wrap:wrap;margin:10px 0 14px}.v960-scope-chip{border:1px solid var(--line);border-radius:999px;padding:5px 9px;text-decoration:none;colo

    src/postmaster/webgui_v962.py, line 37

    *{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-s

  • 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 d1f965baf4fd. can delete files. requests shell access. No manifest field names shell or command execution. dependencies are not pinned. accepts a host from input, with no fixed list in this file. reads an environment variable. contains a minified payload.

Date and source

Date checked:

View source

github.com

Commit graded: d1f965baf4fd2aa1b29266c8d28e3079814bdd6c

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