Proton Mail MCP
未申請Unofficial MCP server for Proton Mail (not affiliated with Proton AG) — send, read, search & organize email over SMTP/IMAP
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ドキュメントに記載されたツール (32)
プロジェクトのドキュメントに基づきます。サーバーのハンドシェイクは、各ツールの説明や動作を検証するものではありません。
bulk_delete
Delete many messages in a single IMAP operation. Same XOR uids/match input and dryRun support as bulkmove. Defaults to soft-delete via the resolved Trash path. A subject/body match appends a staleness warning — Proton's content SEARCH lags ~30–60s, so recent mail can be silently missed; prefer from:
bulk_move
Move many messages in a single IMAP operation. Accepts either an explicit uids array or match criteria (XOR, not both). Supports dryRun: true to preview which UIDs would be affected without making changes — match-based dry-runs run the SEARCH results through a FETCH-based existence pass so the previ
bulk_update_flags
Add or remove flags on many messages in a single IMAP operation. Same XOR uids/match input and dryRun support. Reports notApplied: string[] for flags the server silently dropped across every affected UID (e.g. Proton's user-keyword drop).
bulk_update_labels
Add or remove Proton labels on many messages in a single IMAP operation. Same XOR uids/match input and dryRun support as the other bulk tools. Adds are batched (one COPY of the joined UID range per label); removes walk each label mailbox by Message-ID. Reports notApplied: string[] for labels with no
count_messages
Return a count of messages matching optional criteria, backed by IMAP SEARCH. No envelope fetch — just a number.
create_folder
Create a new mailbox folder. Idempotent — succeeds silently if the folder already exists. Restricted to the Folders/ namespace (e.g. Folders/Receipts); root-level paths are rejected with an actionable error. Labels/... paths are rejected with a redirect to the dedicated createlabel tool. . and .. pa
create_label
Create a new Proton label. Pass the bare label name; the Labels/ prefix is added internally. Idempotent. The response returns the full Labels/X path — copy that into updatemessagelabels.labelsToAdd (which requires the full path, not the bare name).
delete_folder
Delete a folder or label container. Restricted to the Folders/ and Labels/ namespaces so system mailboxes (INBOX, Sent, Trash, etc.) cannot be removed.
delete_message
Delete a message. By default moves to Trash for safety (resolved via special-use annotation); set permanent=true to permanently expunge. Returns the new UID in Trash when available. Soft-deleting a message that is already in Trash is a no-op on the server; the tool detects this and returns an action
delete_thread
Delete all messages in a thread. Per-folder by default; set acrossFolders: true for cross-folder walk.
download_attachment
Download an attachment by MIME part number. Use listattachments or readmessage first to see available parts. By default returns base64-encoded content inline. Bad part numbers produce an actionable error listing known parts.
empty_folder
Permanently empty a folder via atomic UID EXPUNGE (client.messageDelete). Requires confirm: true. By default restricted to Trash and Junk to prevent accidents; set allowAnyFolder: true to target any folder. Pass dryRun: true to preview the count that would be deleted without touching any mail (no co
flag_thread
Add or remove flags on all messages in a thread. Per-folder by default; set acrossFolders: true for cross-folder walk.
folder_stats
Return total/unread counts plus scanned-envelope aggregations: oldest message date, newest message date, and total message bytes. Response includes scanned and truncated fields for transparency.
forward_email
Forward a message to new recipients. Original attachments are carried forward by default. Unlike reply, a forward does not set In-Reply-To/References — it starts its own conversation and leaves the original message's \Answered flag untouched.
get_thread
Get all messages in a conversation thread by walking In-Reply-To and References headers. Returns messages sorted chronologically (oldest first).
list_attachments
List attachment metadata (part numbers, filenames, types, sizes) for a message without downloading the body. Composes with downloadattachment for bulk extraction. The reported size is the decoded file size (roughly what you get on save), estimated from the IMAP-encoded octet count — base64 parts are
list_folders
List all mailbox folders with message and unread counts. No parameters. Counts come from a cached IMAP STATUS that Proton Bridge can serve stale — for an exact count (e.g. before deleting or emptying a folder), use countmessages or folderstats, which query the live mailbox. The output includes a foo
list_messages
List recent messages from a folder. Supports UID-based pagination.
mark_all_read
Mark all unread messages in a folder as read. Optionally limit to messages older than a given date. Pass dryRun: true to preview the affected count without flipping any flags.
move_message
Move a message to a different folder. Returns the new UID in the destination folder when available (requires UIDPLUS server support).
move_thread
Move all messages in a thread to a destination folder. Identified by Message-ID. Per-folder by default; set acrossFolders: true to walk INBOX + Sent + All Mail. When the walk surfaces a thread member only via All Mail (e.g. the message actually lives in Folders/Archive), the server expands the searc
read_message
Read a specific message by UID. Returns full headers, body, and attachment metadata. Prefers plain text; strips HTML tags from HTML-only messages. Body-part selection skips parts marked Content-Disposition: attachment, so a text/plain attachment sitting next to an HTML body is never returned as the
rename_folder
Rename an existing folder or label. Restricted to the Folders/ and Labels/ namespaces on both from and to so system mailboxes (INBOX, Sent, Trash, etc.) can't be renamed — without this guard, renamefolder(from: "INBOX", to: ...) would succeed against Proton Mail Bridge and relocate INBOX's contents.
reply_all_email
Reply to all original recipients (sender + TO + CC), excluding the authenticated user. Same threading + quoting semantics as replyemail. Use this instead of replyemail + replyAll: true for clarity. Self-exclusion covers the whole recipient set including the primary To: replying-all to a message you
reply_email
Reply to a message with proper threading headers (In-Reply-To, References). Includes the quoted original message with attribution by default.
save_draft
Save an email as a draft without sending it. The draft is placed in the user's \Drafts special-use folder (resolved at runtime; falls back to literal Drafts if no annotation). Returns the draft UID when available.
search_messages
Search messages by various criteria. Date filters use IMAP semantics: since is inclusive, before is exclusive.
send_email
Send an email using Proton Mail SMTP.
top_senders
Return a sender frequency table over a configurable date range, sorted by message count descending. Collapses display-name variants of the same address. Each row carries a direction: "self""received" tag so callers scanning All Mail (which spans Sent) can tell outbound from inbound.
update_message_flags
Add or remove flags on a message. RFC 3501 system flags: \Seen (read), \Flagged (starred), \Answered, \Draft, \Deleted, \Recent. User-defined keywords without a backslash prefix are also accepted (alphanumeric + underscore, e.g. Important, CustomTag). Unknown \-prefixed names are rejected.
update_message_labels
Add or remove Proton labels on a message. Labels live under the Labels/ namespace and are additive — the message stays in its source folder while gaining or losing label tags.