IRONMAIL

Encrypted, CMMC-compliant email with calendar and contacts. Built for defense contractors who need a single audit boundary, not an overlay on top of an existing email system. Part of the IRONKEEP suite.

What's in IRONMAIL

Encrypted, compliant email with calendar and contacts.

Six-layer inbound security

Virus scanning, email authentication, URL rewriting, attachment sandboxing, domain reputation scoring, and spoofing warnings, all before delivery.

DLP and threat protection

Outbound rules that block, quarantine, or flag sensitive content by domain, attachment type, keyword, or regex pattern. Automated threat feeds keep blocklists current.

Custom domain and migration

Bring your domain with guided SPF, DKIM, and DMARC setup. Import existing mailboxes via EML, MBOX, or ZIP.

Rules and automation

Filter by sender, recipient, subject, attachment, or size. Move, flag, forward, or auto-reply. Vacation responder with per-sender deduplication.

Calendar and contacts

Shared calendars, meeting invitations with RSVP, free/busy lookup. Contacts with encrypted search. New members get every colleague's card on day one.

Web and mobile

Web app with split-pane layout, three density modes, and keyboard shortcuts. Mobile apps coming soon.

Why IRONMAIL for CMMC

Most defense contractors evaluating email options end up choosing between three configurations: a Microsoft 365 GCC High tenant rebuild that takes three to six months and runs into six figures, a PreVeil overlay that preserves your existing email but creates two compliance boundaries, or a commercial platform with add-ons that may or may not satisfy a C3PAO assessment.

IRONMAIL is the alternative for contractors who want a single, dedicated environment without a tenant rebuild. Email, calendar, and contacts live inside one CMMC-aligned boundary. Compliance is the architecture, not a feature flag.

FedRAMP Moderate-aligned infrastructure with US-only data residency
Administered by US citizens, with no foreign-person admin access
Per-tenant encryption with zero-operator key access
Audit-ready logging for access, configuration, and policy events
Calendar and contacts included in the same compliance boundary
ITAR-aligned controls without negotiating custom terms of service

How IRONMAIL compares

If you are evaluating CMMC-compliant email options, the head-to-head comparisons below cover where each approach fits and where it falls short for small and mid-sized defense contractors.

vs Microsoft GCC High → vs PreVeil → vs Google Workspace → vs Proton Mail →