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mailbox-mcp by jgalea MCP Server

Multi-account email MCP server for Gmail, IMAP, and JMAP: search, send, drafts, labels.

Publisher claimed. No tool list reported, and Pod has not connected to this server.

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Published as mailbox-mcp on npm. Runs locally.

Reviewed GitHub reports

13 GitHub reports passed Pod's relevance review. This can include external user reports, maintainer-confirmed bugs, and concrete feature gaps. It is evidence to inspect, not a count of distinct defects. Showing 10.

Most discussed

create_filter passes add_label straight to addLabelIds, so a filter can apply TRASH or SPAM

Summary

create_filter passes add_label straight into Gmail's addLabelIds with no validation of the value. Gmail's system label IDs are literally TRASH and SPAM, so a single call can install a permanent filter that silently destroys or junks all future matching mail.

Verified against v0.10.0 (2833b26).

Where

src/tools/gmail-only.ts:

const action: Record<string, any> = {};
if (args.add_label) action.addLabelIds = [args.add_label as string];
if (args.remove_label) a

[Read the thread](https://github.com/jgalea/mailbox-mcp/issues/23) · 2026-08-14 · open · external user · 2 comments

### Gmail Date: header reaches the model outside the UNTRUSTED fences (all four read tools), and the fences are never explained to the model

## Summary

The Gmail `Date:` header is the one attacker-controlled field that never passes through `fenceEmailContent`/`fenceEmailHeader`, so it reaches the model outside every fence. An attacker does not need to defeat `escapeFenceTags`; they use the field the escaper never sees.

Separately, the `[UNTRUSTED_*]` markers are never explained to the model, so even correctly fenced content carries no instruction about how to treat it.

Verified against `v0.10.0` (`2833b26`).

## 1. `Date:` is emit

[Read the thread](https://github.com/jgalea/mailbox-mcp/issues/22) · 2026-08-14 · open · external user · 2 comments

### download_attachment: lookup by filename fails (only numeric part id works); contradicts tool docs

## Summary

`download_attachment` fails with `Attachment <name> not found` on IMAP accounts, even when the attachment exists and the exact filename is the one reported by `read_email`. The attachment data itself is retrievable (`export_email` returns the full `.eml` with a valid file inside), so the problem is in resolving the attachment id/part, not in fetching from the server.

## Steps to reproduce

1. On an IMAP account, find a message with a single PDF attachment.
2. `read_email` shows the 

[Read the thread](https://github.com/jgalea/mailbox-mcp/issues/16) · 2026-05-26 · closed · external user · 2 comments

### IMAP search_emails returns no results for non-ASCII (Cyrillic) queries

## Summary

`search_emails` on IMAP accounts returns no results when the query contains non-ASCII (e.g. Cyrillic) characters, even when matching messages clearly exist. ASCII/Latin queries on the same account work fine.

## Steps to reproduce

1. Use an IMAP account that has messages with non-ASCII text in the subject (e.g. a Cyrillic subject).
2. Confirm the message exists, e.g. via `inbox_summary` (it lists a message whose subject contains the word).
3. Call `search_emails` with that non-ASCII

[Read the thread](https://github.com/jgalea/mailbox-mcp/issues/15) · 2026-05-26 · closed · external user · 2 comments

### IMAP search() and messagesSince() call imap.search() without {uid:true} — sequence/UID coincidence breaks on mid-query expungement

## Summary

`ImapProvider.searchMessages` (via `searchByText`) and `ImapProvider.messagesSince` call `imap.search(...)` without the options-level `{ uid: true }` argument. imapflow's `search` returns **sequence numbers** in that mode, but the code then passes those numbers to `fetchAll(...)` without `{ uid: true }` either, so the resulting calls are seq-based throughout.

This works by coincidence in most cases — on mailboxes where messages haven't been expunged, sequence numbers are dense and c

[Read the thread](https://github.com/jgalea/mailbox-mcp/issues/10) · 2026-05-24 · closed · 2 comments

### Most recent

### IMAP provider: all message operations hardcode "INBOX", making multi-folder mailboxes unusable

Every IMAP operation — `search_emails`, `read_email`, `read_thread`, `modify_email`, `batch_modify_emails`, `trash_emails`, and `download_attachment` — opens a lock on `"INBOX"` regardless of what the caller needs:

```ts
const lock = await this.imap.getMailboxLock("INBOX");

This means any message that lives outside INBOX (Sent, Spam, custom folders like INBOX.Work) is completely unreachable. Attempting to read or modify such a message by UID returns Message not found, because the UID n

Read the thread · 2026-04-20 · closed · external user · 1 comment

IMAP provider: inbox_summary reports wrong unread count and empty recent list

inboxSummary() has two bugs:

const status = (this.imap as any).mailbox;
const recent = await this.searchMessages("*", 5);
return { total: status?.exists ?? 0, unread: status?.unseen ?? 0, recent };

Bug 1 — stale unread count: mailbox.unseen is read from imapflow's internal cache rather than queried from the server. The cached value does not reflect the current mailbox state and returns an incorrect count.

Potential fix: issue an IMAP STATUS command via `client.status()

Read the thread · 2026-04-20 · closed · external user · 1 comment

IMAP provider: search_emails wildcard * returns wrong results; inboxSummary recent list broken

searchMessages() passes the query string directly to an IMAP text search:

await this.imap.search({ or: [{ subject: query }, { body: query }] })

When called with query="*", this searches for the literal asterisk character in subject and body. It returns only messages that happen to contain * in their text — a meaningless and inconsistent subset of the mailbox, not "all messages".

This manifests in two places:

  1. search_emails with no meaningful query — callers expecting

Read the thread · 2026-04-20 · closed · external user · 1 comment

IMAP provider: modify_email passes label names as IMAP flags instead of RFC 3501 system flags

modify_email passes caller-supplied strings (UNREAD, FLAGGED, etc.) directly to imapflow's messageFlagsAdd/messageFlagsRemove. These are not valid IMAP flags — RFC 3501 system flags use backslash-prefixed names (\Seen, \Flagged, \Answered, \Deleted, \Draft).

As a result, remove_labels: ["UNREAD"] sends STORE -FLAGS (UNREAD) to the server. Servers may silently accept an unknown keyword removal without error, but

Read the thread · 2026-04-20 · closed · external user · 0 comments

IMAP provider: UID vs sequence number mismatch breaks read_email, modify_email, trash, and download_attachment

All IMAP operations that accept a messageId treat it as an IMAP sequence number, but the IDs exposed to callers (via search_emails, inbox_summary) are UIDs. On any mailbox with more than a handful of messages, the sequence number and UID diverge, so these operations silently fail or hit the wrong message.

Affected methods in src/providers/imap.ts:

Read the thread · 2026-04-20 · closed · external user · 0 comments

See all 13 reports Pod holds for mailbox-mcp by jgalea.

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