DMARCguard vs Mailhardener
Mailhardener earns real respect: EUR-native flat pricing, DANE and hosted MTA-STS depth most vendors skip, and SSO with 2FA on every tier — Free included. What it leaves out, by design, is the layer after detection: guided remediation, blocklist monitoring, webhook alerting, and an entry-tier API. That layer is the comparison.
Comparison last verified July 23, 2026. DMARCguard is our product — check every number against Mailhardener's pricing page .
From Evidence to Action
Mailhardener's published feature set covers monitoring, aggregation, and DNS alerting — no remediation workflow appears on its features page or SLA product list. DMARCguard converts findings into service-specific remediation guidance and trackable action items.
Deliverability, Not Just Authentication
Mailhardener scopes itself to authentication and transport security; blocklist monitoring is not in its published feature list. DMARCguard adds DNSBL blocklist monitoring, so you learn about a listed sending IP before your recipients do.
API and Alerts at Entry
Mailhardener's API is included on the Large (EUR 99/mo) and Enterprise tiers and default on MSP — not on Free or the EUR 19/mo Standard tier — and alerting is email-only. DMARCguard ships API access on every tier and email, Slack, and webhook alerts on Pro.
Feature Comparison
Mailhardener's protocol table is one of the strongest in this series — DANE included. The differences are in what happens after detection.
| Feature | DMARCguard | Mailhardener |
|---|---|---|
| DMARC Monitoring Aggregate (RUA) processing on every tier including Free | ||
| SPF Monitoring Record monitoring and misconfiguration alerts on all tiers | ||
| DKIM Monitoring Record monitoring and validator; no hosted key management | ||
| TLS-RPT Support Dedicated RFC 8460 endpoint with aggregation and TLS-failure alerting, from Free | ||
| DANE/TLSA Support One of the few vendors with DANE: DNSSEC chain validation on all tiers, applied to its own hosted endpoints too | ||
| MTA-STS Hosting Automatic ACME certificates and one-click policy mode change | From Standard (EUR 19/mo) | |
| BIMI Support SVG mark and VMC/CMC asset hosting | From Standard (EUR 19/mo) | |
| ARC Chain Support Not in the supported-standards list | ||
| Failure (RUF) Reports Exists but disabled by default; Mailhardener recommends an internal inbox instead | Partial | |
| SSO + 2FA on Free Tier OIDC SSO and TOTP 2FA on every Mailhardener tier — deliberately not paywalled | 2FA yes; SSO from Pro | |
| Guided Remediation Not in Mailhardener's published feature list or SLA product list | ||
| Blocklist (DNSBL) Monitoring Not offered — Mailhardener's scope is authentication and transport-security monitoring | ||
| Alerting (Email + Webhook) | Email only | |
| API Access Included on Large and Enterprise (default on MSP); not on Free or Standard | Every tier | Large and up |
| No Report-Volume Quotas Unlimited report volume on paid tiers; domains are the only limit |
Pricing Comparison
EUR-native and genuinely cheap at portfolio scale — EUR 19/mo flat for 10 domains undercuts per-domain pricing, ours included. The question is what sits on top of the monitoring.
| Tier | DMARCguard | Mailhardener |
|---|---|---|
| Free | 2 domains, 30 days history, 7 protocols | 1 domain, 1-month best-effort retention; personal/evaluation use only |
| Standard | $3.9/domain/mo — up to 10 domains, 1 year history (founding price) | EUR 19/mo or EUR 199/yr (EUR 16.58/mo effective) — up to 10 domains, 3-month history, unlimited users |
| Large | Per-domain pricing (rate drops from domain 11) | EUR 99/mo or EUR 999/yr (EUR 83.25/mo effective) — up to 100 domains, 1-year history |
| Enterprise / MSP | Custom | Enterprise quote-only (DORA, HIPAA BAA, eIDAS, private instance); MSP per-domain — published example: 50 domains = EUR 199/mo |
Why choose DMARCguard over Mailhardener?
A platform that says what to do next
Mailhardener's own feature and SLA pages describe monitoring, aggregation, and DNS alerting — no remediation workflow is offered. DMARCguard turns the same reports into service-specific remediation guidance for 170+ senders and action items you can resolve or dismiss.
Blocklists watched alongside authentication
Mailhardener deliberately scopes its product to authentication and transport-security monitoring — blocklist checks are not in its published feature list. DMARCguard ships DNSBL blocklist monitoring, so a listed sending IP surfaces as an alert instead of a support ticket from your recipients.
Slack, webhooks, and an API from day one
Email-only alerting and an API that starts at the EUR 99/mo Large tier keep Mailhardener's entry plan out of your incident tooling. DMARCguard delivers email, Slack, and webhook alerts on Pro, and API access on every tier — the free one included.
When Mailhardener is the better fit
A flat EUR 19/mo for 10 domains undercuts every per-domain model at portfolio scale — including DMARCguard's founding rate. Add DANE monitoring on every tier, SSO and 2FA that are never paywalled, and EU-only infrastructure in Amsterdam: for a self-serve technical team with 5-100 domains, Mailhardener is a genuinely strong pick.
Who is each best for?
Who's best for Mailhardener?
Technical EU teams and portfolio owners with 5-100 domains who want flat EUR pricing and transport-security depth: hosted MTA-STS with automatic ACME certificates, DANE/TLSA with DNSSEC validation, TLS-RPT aggregation, and SSO plus 2FA on every tier. Customer data lives exclusively on Mailhardener-operated servers in Amsterdam, and Enterprise adds DORA, HIPAA BAA, and eIDAS options. Best for self-serve buyers comfortable evaluating hands-on, since there is limited public buyer validation — no third-party reviews on G2, Capterra, or TrustRadius.
Who's best for DMARCguard?
Teams that want the platform to close the loop: automatic identification of 170+ sending services, service-specific remediation guidance, action items, DNSBL blocklist monitoring, Slack and webhook alerts, and API access on every tier. If your estate is exactly ten quiet domains and you only need monitoring, Mailhardener's flat EUR 19 is cheaper — DMARCguard is the pick when you want the evidence turned into next steps.
Migrating from Mailhardener
One step deserves real care: leaving hosted MTA-STS in enforce mode. Follow the documented exit order — update the policy ID, then remove the CNAMEs — and export first, because data deletion on termination is irreversible.
- Retain your data first
Mailhardener's terms let you retain and use the DMARC and SMTP TLS reports for your own domains; a bulk export is not documented on every plan, so archive what you need while you still have access. Your tier retains 1 to 12 months of history (1 month Free, 3 months Standard, 12 months Large) — on termination, Mailhardener's data deletion is irreversible.
- Add your domains to DMARCguard
Sign up free and add your domains. Run both in parallel; each platform receives the same aggregate reports.
- Append DMARCguard's RUA address
Add our
rua=mailto:address alongside Mailhardener's in your DMARC record — and our TLS-RPT address if you use it. Reports arrive within 24-48 hours. - Validate parity for 14-30 days
Compare alignment counts and TLS reporting across both dashboards before touching any hosted records.
- Exit hosted MTA-STS in the documented order
If your policy is in enforce mode, this is the step that can block inbound mail when rushed: publish your replacement policy, bump the
_mta-stsTXT record ID so caches refetch, and only then remove the CNAMEs pointing at Mailhardener. - Cancel and restore DNS
Mailhardener's terms oblige you to restore your DNS on exit — sweep for leftover CNAMEs (MTA-STS policy, BIMI assets) after cancellation, then confirm your final export is complete.
Estimated time: ~60 minutes
Frequently Asked Questions
How much does Mailhardener cost?
Mailhardener prices natively in EUR: a Free tier for personal and evaluation use, Standard at EUR 19/mo or EUR 199/yr (EUR 16.58/mo effective) for up to 10 domains, Large at EUR 99/mo or EUR 999/yr (EUR 83.25 effective) for up to 100 domains, and quote-based Enterprise. USD figures on aggregator sites are currency conversions, not list prices.
Does Mailhardener support DANE?
Yes — Mailhardener is one of the few DMARC platforms with real DANE/TLSA monitoring, including DNSSEC chain validation, on every tier including Free, and it applies DANE to its own hosted endpoints. DMARCguard also monitors DANE on the Pro plan. If DANE is on your requirements list, both platforms clear a bar most vendors skip.
Is there a free Mailhardener plan?
Yes, with a boundary: 1 domain, 1-month best-effort retention, and personal or evaluation use only — the SLA lets Mailhardener reject reports from domains whose volume looks commercial. Notably, SSO and 2FA are included even on Free. DMARCguard's free tier is 2 domains with 30 days of history, usable commercially, no credit card required.
Does Mailhardener have an API?
Yes — a public OAuth 2.0 API is included on the Large (EUR 99/mo) and Enterprise tiers per the pricing matrix (verified 2026-07-23), and it is default on the MSP package. It is not offered on Free or the EUR 19/mo Standard tier. Alerting is email-only across plans, with no Slack or webhook delivery. DMARCguard includes API access on every tier, plus email, Slack, and webhook alerts on Pro.
What is the Mailhardener MSP program?
Pay per active domain with no email-volume fees, isolated per-client environments, white-label reports, PSA integrations, and API access by default. The published worked example: 10 customers with 5 domains each — 50 domains — comes to EUR 199/mo. It is one of the clearer MSP pricing pages in the category, and MSPs are visibly its core audience.
What are the best Mailhardener alternatives?
It depends on what you miss. If it is guided remediation, webhook alerting, and deliverability signals on top of authentication monitoring, DMARCguard adds those — with DNSBL blocklist monitoring — at a published per-domain rate. Buyers also shortlist EasyDMARC ($44.99+/mo), Valimail, and URIports — the same names Google's related searches attach to Mailhardener pricing queries.
Other Comparisons
See how DMARCguard stacks up against other providers.
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