SecLens.ONE Email Security

Name: SecLens.ONE Email Security
Author: 42Sec-Pte-Ltd

by 42Sec-Pte-Ltdversion 1.0.0i★ –iRuns in the cloud

Registry nameone.seclens/seclens

Install

Overview

Description from the maker (original English)

Assess any domain's email security across SPF, DMARC, DKIM, MTA-STS, DNSSEC, DANE, and TLS-RPT.

PopNx MCP’s three pillars

These three are never merged into one score: opinions, measurements and popularity are different things.

User voiceiNo reviews yetReviews open together with accounts in a later step
Our basic checksi3 of 3 passedChecked from public information; code not scanned yet
UsageiVery new★ –

What you can do with it

We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.

Connection: Runs in the cloud
Transport: Streamable HTTP
Category: Cybersecurity

Install

Pick the AI app you use, then copy the settings.

Before you install

Basic checks: 3 of 3 passed
Runs on the maker’s server: what you ask it goes through their server.
Can do 3 things (tools) assess_domain, get_result, get_summary
The registry lists no key to fill in.

You need

Runs in the cloudNothing to install; it connects over the internet

Which app do you use?

ClaudeClaude CodeCursorVS CodeChatGPT

Pick your app above. We remember it, so next time the button says “Install in …”.

Works in Claude on the web, desktop and mobile:

Open Settings → Connectors
Press Add custom connector
Paste the address below and press Add
If it asks you to sign in, sign in with the maker

https://seclens.one/mcp

Run this in your terminal

claude mcp add --transport http seclens https://seclens.one/mcp

Open in Cursor

Or copy the settings yourself

Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json

{
  "mcpServers": {
    "seclens": {
      "url": "https://seclens.one/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

Open in VS Code

Or copy the settings yourself

Paste into .vscode/mcp.json in your project

{
  "servers": {
    "seclens": {
      "type": "http",
      "url": "https://seclens.one/mcp"
    }
  }
}

Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.

ChatGPT connects only to servers on the internet:

Open ChatGPT on the web → Settings → Connectors (Apps)
Press Create or Add (some plans need Developer mode under Advanced first)
Paste the address below, give it a name and save
If it asks you to sign in, sign in with the maker

https://seclens.one/mcp

Menu names can differ slightly by plan and over time.

Your choice stays on this device in a cookie; no account needed.

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

What it can do

Tool names and descriptions exactly as the server reported them on Nov 7, 2026. The maker wrote them, not us; we show them as plain text.

assess_domain
Start a public SecLens.ONE email-security assessment for a domain. Poll get_result afterwards.
get_result
Fetch the latest stored public SecLens.ONE assessment for a domain. The JSON includes Remediation.packs, matching the HTML remediation pack. BIMI is included when assessed and does not change the score.
get_summary
Fetch the live public SecLens.ONE corpus snapshot.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 8, 2026

✓ Pass
Maker matches the repo
The registry name was verified against the domain seclens.one (the registry checks domain ownership)
… Not checked yet
Still maintained
We have not read this repo from GitHub yet
… Not checked yet
Has a licence
We have not read this repo from GitHub yet
✓ Pass
Endpoint responds
Responded in 477 ms (HTTP 200)
– Not applicable
Sign-in with OAuth
No sign-in needed
✓ Pass
No hidden instructions in tool descriptions
Read 3 tool descriptions and found no hidden instructions to the AI

Compared with others in Cybersecurityi

More stars than 0% of the other 1000 servers in this category
Published to the registry more recently than 77% of the other 1000 servers in this category
Basic checks equal to or better than 100% of the other 1000 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is SecLens.ONE Email Security safe?

It passed 3 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.

Is it still maintained?

The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 12 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.

What can I use instead?

In the same category: EchelonGraph CVE & Exposure, KillerSkills, Phishnoo Sandbox

Alternatives

Servers in the same category from other makers, sorted by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

EchelonGraph CVE & Exposure

CVE, KEV, EPSS, SBOM and advisory lookups; per-CVE exposure from Shodan data (© Shodan). Keyless.

by echelongraphEarly↓ 1.4K/wkUpdated today

Computer or cloud✓ echelongraph.io

Install

KillerSkills

Security verdicts for agent skills and MCP servers, from sandbox runs, before you install them.

by cyligence-karimGrowing↓ 3.1K/wkUpdated today

Runs on your computer

Install

Phishnoo Sandbox

Explore synthetic security awareness metrics and file example threat reports.

by api.phishnoo.nlEarlyUpdated today

Runs in the cloud✓ api.phishnoo.nl

Install

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

SecLens.ONE email security assessor

Standalone Go CLI for the public email-security checks on SecLens.ONE.

Scored protocols are SPF, DMARC, DKIM, MTA-STS, TLS-RPT, DANE, and DNSSEC. BIMI is informational and does not change the score. The assessor uses passive DNS and one HTTPS GET to the MTA-STS policy endpoint. It does not send mail.

Protocol logic lives in internal/assessor/rfc*/ packages. Thin bridge files wire DNS lookups and scoring.

Source is https://github.com/42Sec-Pte-Ltd/seclens.

Checks

SPF (RFC 7208). Presence, qualifiers, lookup limits, and common misconfiguration hints.
DMARC (RFC 7489). Policy, reporting tags, and enforcement.
DKIM (RFC 6376). Common selector discovery.
MTA-STS (RFC 8461). DNS advertisement, one HTTPS GET of the policy, and MX matching.
TLS-RPT (RFC 8460). _smtp._tls advertisement and reporting URIs.
DANE (RFC 7672). TLSA records for discovered MX hosts.
DNSSEC (RFC 4034 and RFC 4035). DS presence and the DoH AD-bit signal.
BIMI. Informational only. It does not change the score.
Null MX (RFC 7505). Detects domains that do not receive mail.

Bulk assessment uses bounded concurrency. Output is text, JSON, or JSONL. JSON DoH resolvers default to Cloudflare. Google and Quad9 are supported.

MCP Server

Anonymous Streamable HTTP at https://seclens.one/mcp.

Tools are get_result, assess_domain, and get_summary.

Cursor 1-Click Install opens Add SecLens.ONE.

mcp.json:

"mcpServers": { "seclens": { "type": "http", "url": "https://seclens.one/mcp" } } }

Dependencies

Core DNS and HTTP use the Go standard library. One module dependency handles internationalized domain names.

golang.org/x/net/idna handles punycode and IDNA for MTA-STS MX host matching.

Run go list -m all after go mod download to inspect the module graph.

Build

go build -o seclens ./cmd/seclens

Assess

./seclens assess cloudflare.com

./seclens assess --format jsonl example.com google.com cat domains.txt | ./seclens assess --stdin --concurrency 12 --format jsonl > results.jsonl ./seclens assess --file domains.txt --resolver google,cloudflare

Resolver flag values are cloudflare, google, and quad9. Separate a pool with commas.

Tests

go test ./...

Research

The CLI measures the same controls as the SecLens Top-1M studies:

License

Licensed under the Apache License, Version 2.0.

SecLens.ONE Email Security

Overview

PopNx MCP’s three pillars

What you can do with it

Install

Before you install

What it can do

Basic checksi

Maker matches the repo

Still maintained

Has a licence

Endpoint responds

Sign-in with OAuth

No hidden instructions in tool descriptions

Compared with others in Cybersecurityi

Common questions

Alternatives

EchelonGraph CVE & Exposure

KillerSkills

Phishnoo Sandbox

README from the maker

SecLens.ONE email security assessor

Checks

MCP Server

Dependencies

Build

Assess

Tests

Research

License