IMAP mailbox

io.github.ni-c/imap-mcpv0.5.3Search

Read, search and organise any IMAP mailbox, with writes off by default

The current version, v0.5.3, was published to the official MCP registry on 2026-10-19. It is distributed as @ni-c/imap-mcp on npm and as the Docker image ghcr.io/ni-c/imap-mcp:0.5.3, filed under Search by this index, and declares 19 environment variables. Removals and unreachable sources are measured across every server this index tracks, contract drift across the servers that answer in consecutive snapshots; the index's current counts put this record in context.

In-path gate · all MCP tools

Using IMAP mailbox in Claude, Cursor, Gemini CLI, Cline, or Zed?

MCP tool contracts can change remotely with no version bump. The mcpindex gate pins each contract and HOLDs the call when it drifts-before your agent acts. Zero credentials. This is not the package install for this server itself (use Install this server for that).

Install the mcpindex gate (one command)

Rewrites your MCP host config so each server launches behind the gate. Inspect first: curl -fsSL https://mcpindex.ai/install.sh | less

uv tool install mcpindex-gate && mcpindex-config-wire

Auditable install path →Watch it hold a drift →

Trust verdict · v1 advisory · method

REVIEWstatus: PARTIALfresh until 2026-10-27 01:12 UTC

screened 2026-09-01tier: scannedgranularity: description-levelsource: registry

Semantic screen found no manipulation pattern in the description. Conformance probe not yet run.

mcpindex.integrity.descriptionpassINFO

evidence“Normal mailbox access”via static_description

Limits of this verdict

- Semantic screen only - the deterministic conformance probe has not run on this server
- Confidence is reported but not yet calibrated (v1)
- Screen reads the tool description, not the live behavior
- advisory
- registry description only no input schema
- screen model 8b
- Still current: the description we screened is unchanged, re-checked against the registry
- The registry listing (version, packages, links) changed after this screen ran - the description we assessed did not

Semantic screen: an LLM judge reads the tool description for hidden instructions (status PARTIAL). A pass means the description is not lying, not that the tool is safe: a high-capability tool with an honest description still warrants caution. The deterministic conformance probe has not been run on this server yet, so the screen here is semantic-only. Posture: advisory. Confidences are reported but not yet calibrated (calibrated=false at v1). Full verdict history is not shown on this page.

Own this server? Test a description on the public screen → It is a separate check from the verdict above, so the two can differ.

That verdict was true at screening time (snapshot 2026-10-20).

Contracts can change after screening, with no version bump. The gate pins IMAP mailbox’s tool contracts on first sight and holds any silent change before your agent acts - the check that keeps being true on Tuesday.

See your first HOLD in 2 minutes →

Cite this record

People vet a server before wiring it in. One line on your project site or docs answers that with an independent record: screening verdict, registry provenance, contract drift history. It stays current as new screens and drift events land.

Markdown

[Independent trust record for IMAP mailbox](https://mcpindex.ai/server/io-github-ni-c-imap-mcp) - screening verdict, registry provenance, and contract drift monitoring.

HTML

<a href="https://mcpindex.ai/server/io-github-ni-c-imap-mcp">Independent trust record for IMAP mailbox</a> - screening verdict, registry provenance, and contract drift monitoring.

Embed this badge

A live verdict badge for your README or listing. It reflects the current screen, links back here, and updates when the verdict does.

Markdown

[![mcpindex](https://mcpindex.ai/api/v1/badge/io-github-ni-c-imap-mcp)](https://mcpindex.ai/server/io-github-ni-c-imap-mcp)

HTML

<a href="https://mcpindex.ai/server/io-github-ni-c-imap-mcp"><img src="https://mcpindex.ai/api/v1/badge/io-github-ni-c-imap-mcp" alt="mcpindex verdict" height="20" /></a>

Environment variables

IMAP_HOST

required

Hostname of the IMAP server, e.g. imap.example.net

IMAP_USER

required

Mailbox user name

IMAP_PASSWORD

requiredsecret

Mailbox password or app password

IMAP_PORT

Defaults to 993 with implicit TLS, 143 otherwise

IMAP_TLS

implicit (default), starttls or none

IMAP_MAILBOX

Default mailbox to work in (default: INBOX)

IMAP_SEEN_KEYWORD

IMAP keyword marking what the assistant has already seen (default: AiSeen)

IMAP_READ_ONLY

Set to false to register the mailbox write tools; defaults to true

IMAP_ALLOW_TOOLS

Comma-separated tool names or list_* prefixes to register; 'essential' selects a curated preset (default: all tools)

IMAP_DENY_TOOLS

Comma-separated tool names or list_* prefixes to remove from whatever IMAP_ALLOW_TOOLS left

IMAP_DOWNLOAD_DIR

Directory attachments may be written to; unset means the server never touches the filesystem

IMAP_INSECURE_TLS

Set to true to accept self-signed certificates, scoped to this connection

IMAP_DRAFTS_MAILBOX

Drafts folder to save into; by default the one flagged \Drafts is used

IMAP_MAX_MESSAGES

Default number of messages a listing returns (default: 100)

IMAP_MAX_ATTACHMENT_BYTES

Ceiling for returning an attachment inline (default: 1048576)

IMAP_MAX_DOWNLOAD_BYTES

Ceiling for writing an attachment to disk (default: 26214400)

IMAP_MAX_EXTRACT_BYTES

Ceiling for reading a document's text with mode=text (default: 10485760, maximum: 67108864)

IMAP_ATTACHMENT_TYPES

Comma-separated content-type allowlist for attachments

IMAP_TRUSTED_AUTHSERV_ID

authserv-id your provider stamps into Authentication-Results; without it every verdict is reported as forgeable

IMAP_HOST

required

Hostname of the IMAP server, e.g. imap.example.net

IMAP_USER

required

Mailbox user name

IMAP_PASSWORD

requiredsecret

Mailbox password or app password

IMAP_PORT

Defaults to 993 with implicit TLS, 143 otherwise

IMAP_TLS

implicit (default), starttls or none

IMAP_MAILBOX

Default mailbox to work in (default: INBOX)

IMAP_SEEN_KEYWORD

IMAP keyword marking what the assistant has already seen (default: AiSeen)

IMAP_READ_ONLY

Set to false to register the mailbox write tools; defaults to true

IMAP_ALLOW_TOOLS

Comma-separated tool names or list_* prefixes to register; 'essential' selects a curated preset (default: all tools)

IMAP_DENY_TOOLS

Comma-separated tool names or list_* prefixes to remove from whatever IMAP_ALLOW_TOOLS left

IMAP_DOWNLOAD_DIR

Directory attachments may be written to; unset means the server never touches the filesystem

IMAP_INSECURE_TLS

Set to true to accept self-signed certificates, scoped to this connection

IMAP_DRAFTS_MAILBOX

Drafts folder to save into; by default the one flagged \Drafts is used

IMAP_MAX_MESSAGES

Default number of messages a listing returns (default: 100)

IMAP_MAX_ATTACHMENT_BYTES

Ceiling for returning an attachment inline (default: 1048576)

IMAP_MAX_DOWNLOAD_BYTES

Ceiling for writing an attachment to disk (default: 26214400)

IMAP_MAX_EXTRACT_BYTES

Ceiling for reading a document's text with mode=text (default: 10485760, maximum: 67108864)

IMAP_ATTACHMENT_TYPES

Comma-separated content-type allowlist for attachments

IMAP_TRUSTED_AUTHSERV_ID

authserv-id your provider stamps into Authentication-Results; without it every verdict is reported as forgeable

MCP quality score · maturity, not trust · methodology

freshness

completeness

installability

documentation

stability

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Install this server

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "imap-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "@ni-c/imap-mcp"
      ],
      "env": {
        "IMAP_HOST": "<imap_host>",
        "IMAP_USER": "<imap_user>",
        "IMAP_PASSWORD": "<your-imap_password>",
        "IMAP_PORT": "<imap_port>",
        "IMAP_TLS": "<imap_tls>",
        "IMAP_MAILBOX": "<imap_mailbox>",
        "IMAP_SEEN_KEYWORD": "<imap_seen_keyword>",
        "IMAP_READ_ONLY": "<imap_read_only>",
        "IMAP_ALLOW_TOOLS": "<imap_allow_tools>",
        "IMAP_DENY_TOOLS": "<imap_deny_tools>",
        "IMAP_DOWNLOAD_DIR": "<imap_download_dir>",
        "IMAP_INSECURE_TLS": "<imap_insecure_tls>",
        "IMAP_DRAFTS_MAILBOX": "<imap_drafts_mailbox>",
        "IMAP_MAX_MESSAGES": "<imap_max_messages>",
        "IMAP_MAX_ATTACHMENT_BYTES": "<imap_max_attachment_bytes>",
        "IMAP_MAX_DOWNLOAD_BYTES": "<imap_max_download_bytes>",
        "IMAP_MAX_EXTRACT_BYTES": "<imap_max_extract_bytes>",
        "IMAP_ATTACHMENT_TYPES": "<imap_attachment_types>",
        "IMAP_TRUSTED_AUTHSERV_ID": "<imap_trusted_authserv_id>"
      }
    }
  }
}

Cursor (.cursor/mcp.json)

{
  "mcpServers": {
    "imap-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "--",
        "@ni-c/imap-mcp"
      ],
      "env": {
        "IMAP_HOST": "<imap_host>",
        "IMAP_USER": "<imap_user>",
        "IMAP_PASSWORD": "<your-imap_password>",
        "IMAP_PORT": "<imap_port>",
        "IMAP_TLS": "<imap_tls>",
        "IMAP_MAILBOX": "<imap_mailbox>",
        "IMAP_SEEN_KEYWORD": "<imap_seen_keyword>",
        "IMAP_READ_ONLY": "<imap_read_only>",
        "IMAP_ALLOW_TOOLS": "<imap_allow_tools>",
        "IMAP_DENY_TOOLS": "<imap_deny_tools>",
        "IMAP_DOWNLOAD_DIR": "<imap_download_dir>",
        "IMAP_INSECURE_TLS": "<imap_insecure_tls>",
        "IMAP_DRAFTS_MAILBOX": "<imap_drafts_mailbox>",
        "IMAP_MAX_MESSAGES": "<imap_max_messages>",
        "IMAP_MAX_ATTACHMENT_BYTES": "<imap_max_attachment_bytes>",
        "IMAP_MAX_DOWNLOAD_BYTES": "<imap_max_download_bytes>",
        "IMAP_MAX_EXTRACT_BYTES": "<imap_max_extract_bytes>",
        "IMAP_ATTACHMENT_TYPES": "<imap_attachment_types>",
        "IMAP_TRUSTED_AUTHSERV_ID": "<imap_trusted_authserv_id>"
      }
    }
  }
}

Cline (cline_mcp_settings.json)

npx -y -- @ni-c/imap-mcp

Claude Code (claude mcp add)

claude mcp add --scope user imap-mcp -- npx -y -- @ni-c/imap-mcp

Gemini CLI (gemini mcp add)

gemini mcp add -s user imap-mcp npx -y -- @ni-c/imap-mcp

Claude Desktop (Docker)

{
  "mcpServers": {
    "imap-mcp": {
      "command": "docker",
      "args": [
        "run",
        "--rm",
        "-i",
        "--",
        "ghcr.io/ni-c/imap-mcp:0.5.3"
      ],
      "env": {
        "IMAP_HOST": "<imap_host>",
        "IMAP_USER": "<imap_user>",
        "IMAP_PASSWORD": "<your-imap_password>",
        "IMAP_PORT": "<imap_port>",
        "IMAP_TLS": "<imap_tls>",
        "IMAP_MAILBOX": "<imap_mailbox>",
        "IMAP_SEEN_KEYWORD": "<imap_seen_keyword>",
        "IMAP_READ_ONLY": "<imap_read_only>",
        "IMAP_ALLOW_TOOLS": "<imap_allow_tools>",
        "IMAP_DENY_TOOLS": "<imap_deny_tools>",
        "IMAP_DOWNLOAD_DIR": "<imap_download_dir>",
        "IMAP_INSECURE_TLS": "<imap_insecure_tls>",
        "IMAP_DRAFTS_MAILBOX": "<imap_drafts_mailbox>",
        "IMAP_MAX_MESSAGES": "<imap_max_messages>",
        "IMAP_MAX_ATTACHMENT_BYTES": "<imap_max_attachment_bytes>",
        "IMAP_MAX_DOWNLOAD_BYTES": "<imap_max_download_bytes>",
        "IMAP_MAX_EXTRACT_BYTES": "<imap_max_extract_bytes>",
        "IMAP_ATTACHMENT_TYPES": "<imap_attachment_types>",
        "IMAP_TRUSTED_AUTHSERV_ID": "<imap_trusted_authserv_id>"
      }
    }
  }
}

Verdict API

curl -s mcpindex.ai/api/v1/trust/server/io-github-ni-c-imap-mcp

Free-tier verdict as JSON: decision + dimensions + severity. Call it from your agent before it invokes a tool it just discovered.

Details

version: v0.5.3
category: Search
verdict expires: 2026-10-27
quality: 90 / 100
operator: ni-c

Listing

Listed from the official MCP registry. Unclaimed by its maintainer. Maintainer? Email us →

Provenance

Each verdict is bound to a hash of the exact description it judged, so a re-crawl that changes the text produces a new record rather than silently inheriting this one. Verdict history is hash-chained and anchored to Bitcoin via OpenTimestamps (latest confirmed at block 972,115). Verify it yourself.

Links

Repository →Website →