A powerful MCP server for sending emails via 126.com SMTP service. Perfect for AI assistants and automation workflows!
Free
Nothing to run from here
Proton Mail is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
Open Installation—
p95 latency
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call success
local
runs on your machine
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calls last 7d
What it does
Unofficial MCP server for Proton Mail (not affiliated with Proton AG) — send, read, search, and organize email over SMTP and IMAP
Quickstart
# 1 — run it from where its publisher ships it
npx -y proton-mail-mcp
# 2 — ask your agent something
> Unofficial MCP server for Proton Mail (not affiliated with Proton AG) — send, read, search, and organize email over SMTP and IMAP
Proton Mail is free: there is no plan to choose, no cap to set and nothing that can bill you.
Publishernot claimed
SEAll 2 servers
sethbang2 servers
2 categories
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. This one runs on your machine: your client starts Proton Mail as a process under your own user, with your files and your network, so the tool surface below is what it can do to your computer rather than to a server somewhere else. It is scanned, signed and pinned to the version you choose — read the surface before you approve it.
Claude Codedeclared by this listing
This is a public server: you run it yourself and this marketplace is not in the path. Claude Code registers it in one command.
claude mcp add proton-mail-mcp -- npx -y proton-mail-mcpReconnect, or start a new session, and the tools appear in the model’s tool list.
Free to install, and it runs from its publisher’s own package: no account, no key, no card.
What it asks of you
It reaches a system of yours, so it needs your own credential rather than the publisher’s: PROTONMAIL_USERNAME, PROTONMAIL_PASSWORD. You set them after installing; the value is sealed here and sent to the server on each call.
What it writes
One config entry your client uses to start the process locally. A local server runs with your file system and your network, which is why it is priced without metering.
What you approve
32 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
Send an email using Proton Mail SMTP. HTML bodies are sanitized through a conservative allowlist by default (v1.0.0:
Takes no parameters.
Example callreturns →
Reply to an email message. Reads the original message and sends a reply with proper threading headers (In-Reply-To, References). Response leads with a
Takes no parameters.
Example callreturns →
Reply to all recipients of an email (sender + original TO + original CC), excluding the authenticated user. Sends with proper threading headers. Equivalent to
Takes no parameters.
Example callreturns →
Forward an email message. Reads the original message and sends it to new recipients with proper threading headers. Response leads with
Takes no parameters.
Example callreturns →
List available email folders/mailboxes with message counts. The per-folder counts come from a cached IMAP STATUS that Proton Mail Bridge can serve stale — do NOT treat them as authoritative for decisions like
Takes no parameters.
Example callreturns →
List recent messages from an email folder, sorted by date (newest first). Returns subject, sender, date, and flags for each message. A non-selectable namespace container (e.g.
Takes no parameters.
Example callreturns →
Takes no parameters.
Example callreturns →
List attachment metadata for a message without downloading the body. Returns part numbers, filenames, content types, and sizes — use these with download_attachment to fetch the content.
Takes no parameters.
Example callreturns →
Download an email attachment by part number. Use read_message or list_attachments first to see available attachments and their part numbers. By default returns base64-encoded content inline (read-only). When
Takes no parameters.
Example callreturns →
Takes no parameters.
Example callreturns →
Takes no parameters.
Example callreturns →
Takes no parameters.
Example callreturns →
Add or remove flags on an email message. System flags (RFC 3501): \\\\Seen (read), \\\\Flagged (starred), \\\\Answered, \\\\Draft, \\\\Deleted, \\\\Recent. User-defined keywords without a backslash prefix are also accepted (alphanumeric + underscore, e.g.
Takes no parameters.
Example callreturns →
Get all messages in a conversation thread by walking In-Reply-To and References headers. Returns messages sorted chronologically (oldest first).\n\n
Takes no parameters.
Example callreturns →
Mark all unread messages in a folder as read. Optionally limit to messages older than a given date. Pass
Takes no parameters.
Example callreturns →
Save an email as a draft without sending it. The draft is placed in the user
Takes no parameters.
Example callreturns →
Move multiple messages to a different folder in one operation. Provide EITHER
Takes no parameters.
Example callreturns →
Delete multiple messages in one operation. Provide EITHER
Takes no parameters.
Example callreturns →
Add or remove flags on multiple messages in one operation. Provide EITHER
Takes no parameters.
Example callreturns →
Create a new mailbox folder. Returns gracefully if the folder already exists. On Proton Mail, folders must be created under the
Takes no parameters.
Example callreturns →
Create a new Proton label. Pass the bare label name (e.g.
Takes no parameters.
Example callreturns →
Rename a mailbox folder or label. Errors if the source path does not exist. Works for both
Takes no parameters.
Example callreturns →
Delete a mailbox folder or label container. Restricted to the
Takes no parameters.
Example callreturns →
Add or remove Proton labels on a message. Labels live under the
Takes no parameters.
Example callreturns →
Add or remove Proton labels on many messages in one operation. Provide EITHER
Takes no parameters.
Example callreturns →
Permanently delete ALL messages in a folder (atomic UID EXPUNGE via messageDelete). Requires
Takes no parameters.
Example callreturns →
Count messages in a folder matching optional search criteria. Returns just a number (no envelopes fetched). The attachment filters (
Takes no parameters.
Example callreturns →
Return aggregate stats for a folder: total/unread (free), plus scanned-envelope aggregations (oldest/newest/total bytes). Default scanLimit 5000, max 20000. Response always includes scanned/truncated so callers can detect partial results. A non-selectable namespace container (e.g.
Takes no parameters.
Example callreturns →
Return a frequency table of top senders for a folder, optionally filtered by date range. Buckets are keyed by lowercased email address. Default limit 20, scanLimit 5000 (max 20000). Each row carries a
Takes no parameters.
Example callreturns →
Move every message in a thread to a destination folder. By default acts only in the seed message
Takes no parameters.
Example callreturns →
Delete every message in a thread. Default soft-deletes to Trash; permanent:true expunges. acrossFolders:false by default for safety. dryRun:true previews.
Takes no parameters.
Example callreturns →
Takes no parameters.
Example callreturns →
Freeyour plan
$0 forever
- Every tool, no call limit
- No card, no account needed
- Source published under a licence you can read
- Runs on your machine — nothing of it reaches our gateway
- Nothing to cap, because nothing bills
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable. Proton Mail costs nothing to install and nothing to call, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
—
Alert at 80% · then the tool returns a normal MCP error
Used this month: $8.42
$16.58 left
ATrust score 96 / 100
Release 1.0.2 · scanned 25 Aug 2026
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
Threat score99
Client score96
Findings2 threat · 0 capability
Capabilitymoderate
Coveragesource
Verificationsource
Surface digest328d2c21ad25fe054ab421e2c7e195d745e204f0172825813da0f84f33703da4
Score vectorthreat 99 → client 96
| Term | Level | What it prices | Points |
|---|---|---|---|
| −1.2 | |||
| capability-exposure | moderate | capability blast radius (moderate) — client exposure if the model is manipulated | −3 |
| verification-discount | source | publisher verification (provenance) — cryptographic build provenance ties the artifact to its source | −0 |
| coverage-honesty | source | inspection depth (source) — how much of the target the scan could see | −0 |
score = clamp(round(threatScore − E_cap − E_ver − E_cov), 0, 100). No model, no opinion, no network call at scoring time: the same methodology version against the same bytes always produces this number, and every line above is a field of the report rather than a summary of it.
What the scan could actually read
A grade is only as meaningful as its coverage, so the scanner publishes its own depth before it publishes its result.
Tool surfaceread
Implementation sourceread
Package metadataread
Live transportnot available
Tools were statically extracted from the published source (32 recovered), not enumerated from a running server. Tool-poisoning, Unicode-smuggling, capability and toxic-flow analysis ran on this inferred surface, but a mis-parsed registration could be missed or mis-attributed, so tool-derived findings are capped below “confirmed”. To grade the real runtime surface, scan the running server: --command "npx -y <package>".
Capability — what it could do if the model were manipulated
Tags derived from each tool’s schema and the implementation, not from what the tool calls itself. moderate is the level these add up to.
| Tool | Capability tags | Why the tag was assigned |
|---|---|---|
| send_email | external-sink | |
| reply_email | external-sink | |
| reply_all_email | no tags | |
| forward_email | untrusted-inputexternal-sink | |
| list_folders | no tags | |
| list_messages | no tags | |
| read_message | untrusted-input | |
| list_attachments | untrusted-input | |
| download_attachment | untrusted-input | |
| search_messages | no tags | |
| move_message | no tags | |
| delete_message | no tags | |
| update_message_flags | no tags | |
| get_thread | no tags | |
| mark_all_read | untrusted-input | |
| save_draft | no tags | |
| bulk_move | no tags | |
| bulk_delete | no tags | |
| bulk_update_flags | no tags | |
| create_folder | no tags | |
| create_label | no tags | |
| rename_folder | no tags | |
| delete_folder | no tags | |
| update_message_labels | no tags | |
| bulk_update_labels | no tags | |
| empty_folder | no tags | |
| count_messages | no tags | |
| folder_stats | no tags | |
| top_senders | no tags | |
| move_thread | no tags | |
| delete_thread | no tags | |
| flag_thread | no tags |
Toxic-flow graph
The lethal trifecta, checked as a graph rather than as a checklist: untrusted input, a sensitive source and an external sink have to meet before there is a path worth worrying about.
Untrusted input can drive an external action even though no sensitive source is exposed.
Supply chain and provenance
Integrityfirst-seen
Surface digest328d2c21ad25fe05
Scanned2026-08-25
This is the first scan of this surface here, so there is nothing yet to compare it against.
Every result on this tab comes from one deterministic pass over the published package — offline, rule by rule, and auditable line by line above. Same methodology version, same bytes, same score.
Release history
Pinned to 1.0.2 — the install command below asks for that release. A pin is part of an install, so it is kept for this visit and written down when you install.
1.0.2
undated
installedNo release note was published with this version.
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no reviews yet
Reviews are earned
Only accounts with at least 50 real tool calls against this server in the last 90 days can post. Ratings are weighted by how much the reviewer actually uses it, and publishers can reply once per review.
Reviews are earned
Writing one takes an account with at least 50 real tool calls against Proton Mail in the last 90 days. That is the whole gate — there is no other way to post, which is why the counts beside each review are worth reading.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes an account with 50 real tool calls against it.