proton-mail-mcp

Unofficial MCP server for Proton Mail (not affiliated with Proton AG) — send, read, search & organize email over SMTP/IMAP

→ sethbang/proton-mail-mcp · listed on glama

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// key findings

✅

32 tools verified — handlers match their declared behaviour

9 read-only tools verified — handlers contain no write/delete/exec

✅

No credential exfiltration, no sensitive file access, no obfuscation

Static analysis found nothing flowing your secrets to unexpected places.

✅

Open source with a license and README

Anyone can audit the code, the license is declared, and the publisher documents what it does.

🔐

You'll be asked for 2 credentials: IMAP_PASSWORD, PROTONMAIL_PASSWORD

These are read from process.env at runtime. Make sure you trust where they’ll be sent.

// known CVEs in dependencies3 low

Disclosed vulnerabilities in this server's declared npm dependencies (via OSV). Whether each is reachable depends on the installed versions.

lownodemailer@8.0.5GHSA-268h-hp4c-crq3

Nodemailer: CRLF injection in Nodemailer List-* header comments allows arbitrary message header injection

lownodemailer@8.0.5GHSA-r7g4-qg5f-qqm2

Nodemailer: Improper TLS Certificate Validation in OAuth2 Token Fetch Enables Credential Interception

lownodemailer@8.0.5GHSA-wqvq-jvpq-h66f

Nodemailer jsonTransport bypasses disableFileAccess and disableUrlAccess during message normalization

Depend on this server? Get alerted when its CVEs change.Watch this server free →

// required environment variables

This server reads these from process.env. You'll be asked to provide them before it can run.

configALLOW_EMPTY_FOLDER— Folder & label management -- create_folder, create_label, rename_folder, delete_folder (non-destructive on Proton); empty_folder (opt-in via =true; not recommended)

configALLOW_FILE_DOWNLOAD_DIR— Attachments -- send files (base64), download to memory or to disk (saveTo + ), forward a subset by part number

configIMAP_HOST— 127.0.0.1 Proton Mail Bridge host

🔐 secretIMAP_PASSWORD— _falls back to SMTP password_ Bridge password

configIMAP_PORT— 1143 Bridge IMAP port

configIMAP_SECURE— false Use TLS

configIMAP_USERNAME— _falls back to SMTP username_ Bridge username

configPROTONMAIL_HOST— smtp.protonmail.ch SMTP host

🔐 secretPROTONMAIL_PASSWORD— "": "your-smtp-password"

configPROTONMAIL_PORT— 587 SMTP port

configPROTONMAIL_SECURE— false Use TLS (true for port 465)

configPROTONMAIL_USERNAME— "": "your-email@protonmail.com",

configREADONLY— false Disable all mutating tools (send/reply/forward, drafts, move/delete/flags/labels, bulk_, create/rename/delete folders + labels, empty_folder, thread mutations)

configRESTRICT_OUTBOUND_TO_SELF

// full audit trail

The full breakdown of what we checked, the deductions that landed, the network hosts, the dependency advisories, and concrete fix guidance is available to verified publishers.

// improvement guidance — verified publishers only

We have 3 concrete improvements we can share with the publisher of this MCP. Each comes with specific guidance to raise the trust score.

// embed badge in your README

[![M8ven Score](https://m8ven.ai/badge/mcp/sethbang-proton-mail-mcp-mh30sz)](https://m8ven.ai/mcp/sethbang-proton-mail-mcp-mh30sz)

commit: a1672fd527bba92b8ed1b490ae56fcb3840441ec

code hash: 7eab93bb33e04cb306bbe4915269c2bd82d756ee1daeb3cfcdbe5eb30793d5b1

verified: 6/18/2026, 11:39:34 AM

view raw JSON →