I matched MX records against a vendor rule dictionary for 2,584 SEC EDGAR-linked entities. The Microsoft 365 share was unsurprising. The gateway market is a duopoly: Proofpoint and Mimecast account for 91.4% of non-mailbox MX matches.
9 Jun 2026 · 11 min read
Infrastructure Research Directory
Browse observed tech stacks, DNS posture, and open services for organisations. All data sourced from public authority records.
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