NSO Group vs mailspoof: 2026 Comparison
NSO Group is a commercial offensive security tool by NSO Group. mailspoof is a free offensive security tool. Compare features, ratings, integrations, and community reviews side by side to find the best offensive security fit for your security stack.
CST VerdictBased on our analysis of NIST CSF 2.0 coverage, core features, company size fit, deployment model, here is our conclusion:
Government intelligence and law enforcement agencies need NSO Group's Pegasus platform for targeted lawful interception against encrypted communications where traditional signals intelligence hits a wall. The tool's three-decade operational history across 40-plus countries demonstrates sustained effectiveness in counter-terrorism investigations that NIST DE.CM and DE.AE monitoring cannot replicate alone. This is explicitly not for private sector buyers, smaller governments without legal frameworks for targeted surveillance, or any organization uncomfortable with the reputational and regulatory scrutiny that comes with deployment.
Security teams running email infrastructure audits need mailspoof to quickly inventory which of your domains can be spoofed through SPF/DMARC misconfigurations before attackers find them first. The command-line interface makes it easy to batch-scan hundreds of domains in minutes, catching gaps that manual record review misses. Skip this if you're looking for continuous monitoring or automated remediation; mailspoof is a one-time assessment tool, not a runtime defense system.
