Mailhardener

Mailhardener is a Netherlands-based SaaS platform that helps any domain owner secure and monitor email infrastructure by implementing open standards — DMARC, SPF, DKIM, MTA-STS, BIMI, DANE/TLSA, and SMTP TLS Reporting — through a unified self-serve dashboard with tiered plans for individuals, enterprises, governments, and MSPs.

Company typePrivate
Founded2018
HeadquartersThe Hague, Netherlands
Headcount1–10
GTM typeB2B
OfferingSoftware

What Mailhardener does

Mailhardener B.V. is a Netherlands-based, bootstrapped SaaS provider of an integrated email-hardening platform that helps domain owners secure and monitor their email infrastructure using open standards. Founded in 2018 and headquartered at the Caballero Fabriek business center in The Hague, the company operates a multi-tenant web application built on DMARC, DKIM, SPF, MTA-STS, BIMI, DANE/TLSA, and SMTP TLS Reporting — processing aggregate and forensic DMARC reports (RFC 7489) and SMTP TLS reports (RFC 8460), and providing managed hosting for MTA-STS policy files, BIMI assets (VMC/CMC certificates and SVG logos), and SPF records. The platform is differentiated by consolidating standards-based email authentication, monitoring, and asset hosting into a single dashboard rather than addressing individual standards in separate tools.

The platform is sold primarily via self-serve sign-up through mailhardener.com on a tiered SaaS model — Free (single-domain evaluation), Standard (up to 10 domains / 3-month retention), Large (up to 100 domains / 12-month retention), MSP, Enterprise (custom), and Government (custom) — with API-first architecture (OAuth 2.0 client_credentials) included for Large, Enterprise, MSP, and Government tiers. Enterprise and Government tiers are sold through a direct sales motion on multi-year contracts; the MSP tier is delivered through a dedicated multi-tenant portal and PSA integrations for managed service providers. All infrastructure runs in the NorthC datacenter in Amsterdam via hosting partner TransIP, with payments processed by Stripe and SSO federated through OpenID Connect to Microsoft Entra ID, Google Workspace, and Okta Workforce.

The customer base is horizontal — 'any domain owner' — ranging from individuals evaluating a personal domain to enterprise and government organizations, with a secondary segment of MSPs reselling to end clients. Marketing is conducted through content (knowledge base, blog), free online validation tools, SEO, and an X/Twitter presence, with no public customer logos disclosed. The company is privately held and shows no evidence of external institutional funding in the source materials, operating as a small (1–10 employees), founder-led business serving a niche email-security vertical that is being pulled by regulatory pressure on DMARC adoption and growing enterprise focus on email authentication.

Mailhardener firmographics

Firmographics

Name: Mailhardener
Legal name: Mailhardener B.V.
Website: https://mailhardener.com
Company type: Private
Founded year: 2018
Operating status: Operating
Headcount range: 1–10 employees
Short description: Mailhardener is a Netherlands-based SaaS platform that helps any domain owner secure and monitor email infrastructure by implementing open standards — DMARC, SPF, DKIM, MTA-STS, BIMI, DANE/TLSA, and SMTP TLS Reporting — through a unified self-serve dashboard with tiered plans for individuals, enterprises, governments, and MSPs.
Ownership category
akta.pro rank

Mailhardener industry classification

Industry

Product category: Email Security Software
NAICS: Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518)
SIC: Services-Prepackaged Software (7372)
akta.pro primary industry: Email Authentication & Domain Protection (DMARC/SPF/DKIM) (HDADAKAC)

Keywords

Email security platform
Domain email monitoring
DMARC compliance
Email authentication
Anti-phishing solutions

Where Mailhardener is headquartered

Location

Headquarters

HQ city: The Hague
HQ country: Netherlands
HQ region: Europe

Offices1 record

Markets served

Mailhardener business model

Business model

GTM type: B2B
Offering type: Software
Cost components: Technology or R&D, Infrastructure, Personnel, Operations, Marketing or Sales

Revenue model

Subscription SaaS (tiered): Mailhardener generates revenue through tiered SaaS subscription plans. Tiers are differentiated by the number of domains monitored and data retention period. A free tier is available for single-domain evaluation and non-commercial use. Paid tiers include Standard (up to 10 domains), Large (up to 100 domains), Enterprise (configurable), Government (configurable), and MSP (configurable per client tenant).
Freemium / Free Evaluation: Mailhardener is free to use for a single domain for evaluation and non-commercial purposes. This serves as a top-of-funnel acquisition motion, converting users to paid tiers as domain count and retention needs grow.

Pricing tiers

Model	Billing	Price
Freemium	Others	Free — 1 domain, fair use
Subscription	Annual	Standard — up to 10 domains, 3 months retention
Subscription	Annual	Large — up to 100 domains, 12 months retention
Subscription	Multi-year contract	Enterprise — configurable domains, contract duration retention
Subscription	Multi-year contract	Government — configurable domains, contract duration retention
Subscription	Annual	MSP — configurable per-tenant domains, 12 months retention

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Mailhardener product offering

Product offering

Core offering

Mailhardener is a SaaS email hardening platform that helps domain owners configure, monitor, and enforce email security standards (DMARC, SPF, DKIM, MTA-STS, BIMI, DANE/TLSA, SMTP TLS Reporting) from a single dashboard. It aggregates DMARC and SMTP TLS reports from receiving mail servers, hosts MTA-STS policies and BIMI assets, monitors DNS records across email security standards, and provides multi-tenant management for Managed Service Providers managing multiple client environments.

Product overview

Mailhardener is a unified email hardening platform consisting of the Mailhardener Email Hardening Suite, which provides comprehensive email security monitoring and enforcement. The core platform processes DMARC aggregate and failure reports (RFC 7489), SMTP TLS reports (RFC 8460), and monitors DNS records across multiple email security standards. The platform integrates hosted services for MTA-STS policy hosting (RFC 8461), BIMI asset hosting, and SPF policy hosting. The Mailhardener Dashboard serves as the primary interface with multi-user/multi-tenant support and role-based access control. The product also includes a suite of free online validation tools and an MSP module for managed service providers to manage multiple client environments.

Differentiator

Problem solved

Functional benefit

Products and services

Mailhardener Email Hardening Suite

Companies that use Mailhardener

Customer profile

Segments3 records

Ideal customer profiles3 records

Mailhardener technology and API

Technology

Technology focussed Yes

API detail

Has API: Yes
API docs
API detail

Core technology

AI maturity

App detail

Integration3 records

Mailhardener partnerships and signals

Strategic signal

Partnerships

Ten partnerships are on record, tiered core and minor.

Microsoft Entra ID (Microsoft Corporation)coreTechnology or IntegrationMailhardener supports Microsoft Entra ID (formerly Azure AD) and Microsoft Personal Account (MSA) as SSO identity providers via OpenID Connect. Mailhardener is a certified Microsoft partner with a registered application ID (e03cae52-4fc3-4368-acf6-ce042b59a632) for Entra integration.
Google LLCcoreTechnology or IntegrationMailhardener supports Google Accounts (Google Workspace and personal Gmail) as an SSO identity provider via OpenID Connect, and is an approved Google partner. Gmail supports BIMI for displaying brand logos, and Google is actively piloting BIMI. Mailhardener also uses Google Workspace internally for email collaboration.
Okta, Inc.coreTechnology or IntegrationMailhardener supports Okta Workforce identities as an SSO provider via OpenID Connect. Mailhardener is listed in the Okta OIN (OIN) catalog. Setup requires coordination between Mailhardener support and the customer's Okta administrator to configure Client ID and Client Secret.
Microsoft Corporation (Exchange Online / Office 365)coreTechnology or IntegrationMicrosoft officially released DANE/TLSA support for Office 365 Exchange Online, enabling outbound DANE verification and inbound TLSA records for Microsoft email services. Mailhardener has observed and can aggregate the resulting SMTP TLS reports from Microsoft. Microsoft is a major email provider whose DANE support validates the email hardening ecosystem.
NorthC Datacenters (NorthC Group B.V.)coreOthersNorthC Datacenters is the physical data center operator for Mailhardener's infrastructure. Located in Amsterdam, Netherlands. NorthC holds ISO 27001, ISO 9001, ISO 14001, PCI DSS, NEN 7510, and ISAE 3402 type-II certifications.
TransIP (team.blue nl B.V.)coreOthersTransIP is Mailhardener's hosting partner, providing the server infrastructure on which Mailhardener services run. TransIP holds ISO 27001:2013, ISO 9001:2015, and NEN 7510:2017 certifications.
Stripe, Inc.minorOthersStripe is used for payment processing including card payments, PayPal, and Klarna. Mailhardener customers paying by card use Stripe's PCI-DSS and SOC-2 compliant payment infrastructure.
Moneybird B.V.minorOthersMoneybird handles Mailhardener's financial administration and invoicing. Moneybird holds ISO 27001 certification and processes organization name, billing address, tax number, and invoices.
Sentry, Inc.minorOthersSentry is used as an error and exception tracking service for Mailhardener applications. Any potential PII is scrubbed from error reports before being sent to Sentry. Sentry holds ISO 27001 and SOC-2 certifications.
Tarsnap Backup, Inc. (with Amazon AWS)minorOthersTarsnap Backup, backed by Amazon AWS, provides encrypted off-site backup storage for Mailhardener. Backup archives are encrypted by Mailhardener before distribution, ensuring Tarsnap and AWS cannot access the data or decryption keys.

Scale indicators2 records

Recent moves6 records

Expansion highlights6 records

Mailhardener competitors and assessment

Company assessment

Direct peers

Sendmarc: Sendmarc is a DMARC/SPF/DKIM enforcement and reporting SaaS aimed at MSPs, with comparable tiered pricing and MSP portal functionality in the same email authentication niche.
EasyDMARC: EasyDMARC is a direct peer offering DMARC, SPF, DKIM monitoring and managed services to MSPs and SMBs, with overlapping MSP/channel GTM.
dmarcian: dmarcian focuses on DMARC aggregate report monitoring and policy enforcement, serving the same horizontal 'any domain owner' segment with overlapping DMARC reporting and SPF/DKIM tooling.
Valimail: Valimail is a direct competitor offering automated DMARC enforcement and email authentication, targeting enterprise and MSP segments with similar SaaS tiers and an SPF/DKIM/DMARC focus.
Red Sift OnDMARC: Red Sift's OnDMARC product competes head-to-head on DMARC monitoring, BIMI and email authentication as a SaaS suite marketed to enterprises and MSPs.
PowerDMARC: PowerDMARC is a direct competitor in the DMARC/SPF/DKIM/BIMI monitoring and MSP-focused email authentication SaaS market, with comparable freemium and partner-led GTM.

Broad incumbents

Mimecast: Mimecast is an established email security and resilience vendor whose DMARC Analyzer and broader suite compete with Mailhardener's platform for enterprise email authentication budgets.
Proofpoint: Proofpoint is a major email security incumbent whose broader Secure Email Gateway and Email Fraud Defense overlap with Mailhardener's authentication/monitoring features as part of a much wider portfolio.
Agari (Fortra): Agari by Fortra is a direct competitor in DMARC/email authentication and anti-phishing, now embedded in a much larger security vendor portfolio aimed at enterprise email fraud defense.
Microsoft Defender for Office 365: Microsoft Defender for Office 365 includes built-in DMARC/SPF/DKIM policy features for Exchange Online customers and represents the incumbent threat if Microsoft deepens native email authentication controls.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Mailhardener compliance and trust

Trust signal

Compliance6 records

Mailhardener financial estimates

Financial estimate

Revenue estimate

Valuation estimate

Mailhardener leadership team

Management profile

Number of profiles

Mailhardener funding detail

Funding detail

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

Mailhardener M&A and investment

M&A and investment

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Mailhardener

What does Mailhardener do?

Is Mailhardener a public or private company?

Mailhardener is a private company. It is classified as founder individual operated bootstrapped and is currently operating.

When was Mailhardener founded?

Mailhardener was founded in 2018. It employs 1 to 10 people.

Where is Mailhardener based?

Mailhardener is headquartered in The Hague, Netherlands, in the Europe region.

How does Mailhardener make money?

Two revenue lines are on record. Subscription SaaS (tiered) is the primary driver. The others are freemium / Free Evaluation.

Who are Mailhardener's main competitors?

Direct peers on record are Sendmarc, EasyDMARC, dmarcian, Valimail, Red Sift OnDMARC and PowerDMARC. Broad incumbents are Mimecast, Proofpoint, Agari (Fortra) and Microsoft Defender for Office 365.

Does Mailhardener have an API?

Yes. The Mailhardener API is the primary and exclusive means of access to customer data. API access is available by default for customers using 'Mailhardener for MSP', 'Mailhardener for Enterprise' or 'Mailhardener Large' package. API clients authenticate using OAuth 2.0 with the 'client_credentials' grant type. Customer data can be accessed exclusively through the Mailhardener API. API client credentials are managed via the 'team' (IAM) module in the Mailhardener Dashboard application. Developer documentation is at No Information.

What industry is Mailhardener in?

Mailhardener's product category is Email Security Software. Its primary akta.pro industry code is HDADAKAC, Email Authentication & Domain Protection (DMARC/SPF/DKIM). Its NAICS code is 518 and its SIC code is 7372.