MailXaminer Email Decryption vs NotRuler: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros & cons — compared head-to-head.
MailXaminer Email Decryption is a commercial digital forensics and incident response tool by MailXaminer. NotRuler is a free digital forensics and incident response tool. Compare features, ratings, integrations, and community reviews side by side to find the best digital forensics and incident response 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:
Forensic investigators and incident responders handling encrypted email evidence will find MailXaminer Email Decryption indispensable for unlocking S/MIME and OpenPGP communications from PST, OST, and EDB files without manual key-by-key decryption. Bulk CSV import of decryption keys and automatic encrypted email detection cut analysis time significantly in large mailbox reviews, and the tool directly supports RS.AN incident analysis workflows. Skip this if you need real-time email gateway decryption or live mailbox scanning; MailXaminer is strictly a forensic analysis tool for already-collected email archives.
Exchange administrators defending against Ruler-based attacks need NotRuler because it's the only free tool that directly detects the client-side Outlook rules and VBScript forms that Ruler exploits, catching what most EDR and email gateway logs miss. The 94 GitHub stars and active development indicate it's trusted by practitioners who've actually hunted this attack chain. Skip this if your organization has already replaced Outlook client rules with Conditional Access policies or if you lack Exchange on-premises infrastructure; NotRuler solves a specific post-compromise detection problem, not general email security.
