# mailspoof vs NSO Group: side-by-side comparison (2026)

[mailspoof](https://cybersectools.com/tools/mailspoof) is a free [email security platforms](https://cybersectools.com/categories/email-security-platforms) solution. [NSO Group](https://cybersectools.com/tools/nso-group) is a commercial [red-team & adversary emulation](https://cybersectools.com/categories/offensive-security) solution by [NSO Group](https://cybersectools.com/companies/nso-group). Features, integrations, deployment and the company behind each one, side by side.

Need the answer fast? [Best Email Security Solutions for Business](https://cybersectools.com/shortlists/best-email-security-platforms) picks Proofpoint Core Email Protection, Microsoft Defender for Office 365, Mimecast Advanced Email Security and 4 more.

## Side-by-side comparison

| | mailspoof | NSO Group |
|---|---|---|
| Pricing model | Free | Commercial |
| Category | Email Security Platforms | Red-Team & Adversary Emulation |
| Verified | No | No |
| Deployment type | On-Premises | On-Premises |
| Company size fit | Startup, SMB, Mid-Market, Enterprise | Enterprise |
| GitHub stars | 131 | – |
| Last commit | Oct 2020 | – |
| Company | – | NSO Group |
| Headquarters | – | – |

### Use cases and capabilities

| | mailspoof | NSO Group |
|---|---|---|
| Red Team | Yes | – |
| OSINT | Yes | Yes |
| Spoofing | Yes | – |
| DMARC | Yes | – |
| SPF | Yes | – |

### Core features

**mailspoof**

No features listed.

**NSO Group**

5 features listed. Sign in on the page to see them.

## Which one fits you

Based on what each listing shows: deployment, company size, price and open source.

- [mailspoof](https://cybersectools.com/tools/mailspoof) fits if you are a startup or a small business or a mid-market company, you need a free product and you want an open-source product.

## mailspoof vs NSO Group FAQ

Common questions when comparing mailspoof vs NSO Group for email security platforms.

### What is the difference between mailspoof and NSO Group?

**mailspoof**: A command-line tool that analyzes SPF and DMARC records to identify domains vulnerable to email spoofing attacks.

**NSO Group**: Govt-focused cyber intelligence & surveillance software provider. Built by NSO Group.

The table above shows where their features, integrations, deployment and company size fit differ.

### Who makes mailspoof and NSO Group?

**mailspoof** is open-source with 131 GitHub stars. **NSO Group** is made by NSO Group. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

### Is mailspoof a good alternative to NSO Group?

In part. mailspoof and NSO Group are not in the same category on CybersecTools. Both cover OSINT. Key differences: mailspoof is Free while NSO Group is Commercial, mailspoof is open-source. Use the table above to see where features, deployment and company size fit differ.

## Related comparisons

- [mailspoof vs Ironscales DMARC Management](https://cybersectools.com/compare/ironscales-dmarc-management-vs-mailspoof)
- [mailspoof vs Sendmarc DMARC Managed Services](https://cybersectools.com/compare/mailspoof-vs-sendmarc-dmarc-managed-services)
- [mailspoof vs InboxSeguro](https://cybersectools.com/compare/inboxseguro-vs-mailspoof)
- [NSO Group vs Ironscales DMARC Management](https://cybersectools.com/compare/ironscales-dmarc-management-vs-nso-group)
- [NSO Group vs Sendmarc DMARC Managed Services](https://cybersectools.com/compare/nso-group-vs-sendmarc-dmarc-managed-services)
- [NSO Group vs InboxSeguro](https://cybersectools.com/compare/inboxseguro-vs-nso-group)

## Alternatives to each

- [See all mailspoof alternatives](https://cybersectools.com/alternatives/mailspoof)
- [See all NSO Group alternatives](https://cybersectools.com/alternatives/nso-group)

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Source: https://cybersectools.com/compare/mailspoof-vs-nso-group

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More on mailspoof and NSO Group: funding, momentum, hiring and news, plus the full product and company record, are available through the Mandos MCP Server (paid plans), which connects to AI assistants: https://mandos.io/mcp?utm_source=cybersectools.com&utm_medium=compare-md