Mailhardener on a Mac
All-in-one email-security monitoring & reporting (cloud) · Email Deliverability & Reputation
Mailhardener monitors and reports on the full email-security stack — DMARC (aggregate + forensic), SPF, DKIM, MTA-STS, TLS-RPT and BIMI — with a guided setup, alerts and human-readable reports to take a domain to DMARC enforcement. SaaS with an API; store credentials in Keychain. Privacy-focused, with a free tier.
Run Mailhardener with FrontierStack
FrontierStack lists Mailhardener in its Email Deliverability & Reputation catalog. Mailhardener is a hosted service, so there is nothing to install — connect your account with an API token and FrontierStack watches it alongside everything you self-host: reachability, its published status, and alerts when it stops answering. Credentials stay in your Mac's Keychain.
Run it all from one Mac app.
FrontierStack installs, monitors and secures the whole stack — locally and across your fleet — from a single native macOS app.
Download FrontierStack