Group	Criterion	SecuMailer	Value
Availability	Minimum availability (6.1.2)	Yes	99.95%
Maximum downtime duration (6.1.3)	Yes	0
Maximum data loss (6.1.4)	Yes	0
Integrity	Origin verification (6.1.5)	Yes	eIDAS “Substantial” and “High”
Data integrity (6.1.6)	Yes	TLS / DANE
Non-repudiation of sender (6.1.7)	Yes	TLS / SPF / DKIM / DMARC
Sender authorization (6.1.8)	Yes	TLS / SPF / DKIM / DMARC
Confidentiality	Data confidentiality (6.1.9)	Yes	AES256
Access confidentiality (6.1.10)	Yes	eIDAS “Substantial” and “High”
Communication confidentiality (6.1.11)	Yes	TLS / DANE
Legal basis for transmission (6.1.12)	No	Transmission basis is determined by the sender
International ad-hoc message traffic (6.1.13)	Yes	EU-based
Usability	Continuity of ad-hoc messaging – replies (6.1.14)	Yes	ESMTP
Continuity of ad-hoc messaging – forwarding (6.1.15)	Yes	ESMTP
Security as convenience (6.1.16)	Yes	ESMTP
Readability (6.1.17)	Yes	ESMTP
Own copy (6.1.18)	Yes	ESMTP
Interoperability	File integration (6.1.19)	Partial	An API is available
Multi-channel communication (7.2)	Yes	NTA 7516 Certified

eIDAS Qualified Registered Email

The smarter alternative to a registered letter: faster, safer, and more cost-effective

Why wait for a registered letter to be delivered when you can send a legally binding, fully compliant message in seconds? With SecuMailer’s eIDAS Qualified Registered Email, you get the same legal status as a registered letter but without paper, postage, or delays.

Instant, secure, EU-wide compliance, and effortless for both sender and recipient.

SecuMailer is the only Dutch qREMS provider on the EU Trusted List.
Delivering the highest level of trust for legally binding registered email, recognised across all EU member states.

Legal Certainty

Same legal status as a registered letter, recognised EU-wide.

Save time

Type, send, and deliver instantly, no postal delays.

Cut Costs

Reduce costs by up to 10x compared to physical registered post.

Stay compliant

100% GDPR, NTA 7516, and eIDAS proof. All data stays within the EU.

Why Choose Qualified Registered Email?

When a message needs to hold up in court, standard secure email isn’t enough. eIDAS Qualified Registered Email gives you the legal certainty, speed, and cost savings your organisation needs without compromising privacy or ease of use.

Perfect for legal notices, government decisions, financial statements, contracts, compliance notifications, and any communication where proof of delivery is critical.

How eIDAS registered mail with SecuMailer works

From send to secure in five seamless steps.

Step 1

Write and send

Write your message in your usual email client, such as Outlook, Microsoft 365, or Google Workspace. Simply send it with one click.

Step 2

Qualified timestamp and proof generation

As part of the delivery process, the message is sealed with a qualified electronic timestamp and every step, from sending to delivery to receipt, is logged in a tamper-proof audit trail. This process makes your email legally valid.

Step 3

Recipient authentication

The recipient receives a notification and authenticates their identity. After that, the registered email is delivered directly to their inbox. This ensures the message reaches the right person, securely and verifiably

Step 4

Direct inbox delivery

Once authentication is complete, the email is delivered directly to the recipient’s inbox. Once it’s delivered, the email is removed from our server.

Step 5

Proof of delivery

Both sender and recipient receive confirmation of delivery including proof that holds up in court.

Want more technical detail?

Product Features of Registered mail

Email from your own email environment

You send emails as usual with Outlook, Gmail, or your server - no change. Secufolder ensures secure delivery in the background using patent-pending 25 step method securely via an alternative method - ensuring 100% safe delivery.

Delivery to the recipient's mailboxt

Optional 2FA for recipients. Delivery possible via SMS or MMS once every 90 days, after which they cannot access incoming emails with a direct download. Organization can adjust this verification period..

Every email always secure

Security at the organization level. Encryption on transfer of all emails to send emails—everything is secured by default unless exceptions are made for common recipient errors and data leaks.

Delivery without portal intermediaries

No portals, plug-ins, or download links. Automatic mail processing, scans, implying only a professional email setup. We handle the rest..

No additional installation or extra software required

SecuMailer is a SaaS (Software as a Service) solution. It’s cloud-based, so there’s no need to install any software. It integrates seamlessly with your existing mail server.

Works with all email clients

YCompatible with all major email clients. SecuMailer connects effortlessly with Outlook, Google Workspace, and Microsoft 365 (including F3), making it ideal for online email platforms.

Works on all devices

Send secure emails from any device, anywhere. Whether you're using a desktop, smartphone, or tablet, your emails are always secure, no extra steps required. Work flexibly from any location on any device.

Integration with back-office systems possible

Integrates with various back-office systems. You can send emails directly from a file or case system, keeping all communication linked and documented in one place.

Delivery receipt available

After delivery, the email content is deleted from our servers. We only retain the delivery receipt the legal proof that your email was successfully sent.

Functional / shared mailboxes possible

Shared mailboxes? No problem. Need to send secure emails from a shared inbox like ‘info@’? SecuMailer fully supports this.

Custom branding applicable

Maintain your branding. Since SecuMailer operates entirely in the background, your emails retain your original layout and branding.

Standard attachment size up to 40MB

Send attachments up to 40MB by default. Need to send larger files? Add our Large File plug-in to send up to 5TB. Regularly exchanging large files with clients? Our WebApp SecuFiler might be a perfect fit.

Integration with any professional mail server

Connect SecuMailer to the mail server of any professional email client, such as on-premises Exchange, Exchange Online, or Google Workspace.

Implementation based on existing features

No additional software is needed to connect with SecuMailer. We integrate using your email server's existing features..

Security based on existing features

SecuMailer enhances your existing security measures to ensure 100% compliance with all laws and regulations applicable to your industry.

Security based on transport rules

With mail flow rules, you maintain full control over your email security. As a result, emails are typically sent securely to every recipient. You can also create exceptions using the same rules, like sending Friday lunch orders to the local bakery..

No additional installation or extra software required

API integrations available

Various API integrations are available: REST API and SMTP API. A technical demo can explore the specific options for your organization.

(Audit) logging available

center>After we deliver the email to the recipient, its contents are removed from our server. However, we retain metadata, which is accessible through logging.

Two-factor authentication via SMS

If delivery with 2FA is chosen, the email recipient must verify their identity via SMS using two-factor authentication. By default, this verification remains valid for 90 days, though this can be configured by your organization.

Integration with back-office systems possible

SAML / SSO available for the admin portal

Access to the SecuMailer admin portal can be secured with 2FA, and Single Sign-On (SSO) based on SAML is also available.

GDPR

By using SecuMailer, you are guaranteed to comply with GDPR requirements. Questions? One of our privacy specialists will gladly help!

Data minimization

We specialize in data minimization, one of the core GDPR principles. Unlike portal solutions, emails disappear from our platform after delivery, meaning we do not store privacy-sensitive information. What isn’t there can’t be leaked.

ECSO (European Cyber Security Organization)

We are proud to be the only recognized provider for Secure Emailing certified as a full European Cyber Security solution. The ECSO label distinguishes European cybersecurity companies that operate based on European values. On May 9, 2023, Security Delta (HSD) awarded this label to SecuMailer.

ISO 27001

SecuMailer is ISO 27001 certified, the leading standard for information security. A copy of the certificate and statement of applicability is available upon request.

NEN 7510

SecuMailer is NEN 7510 certified, the standard for information security in healthcare. A copy of the certificate and statement of applicability is available upon request.

NTA 7516

SecuMailer meets all requirements of the NTA 7516 and was certified until May 2023. This is the standard for secure emailing in healthcare and legal sectors.
View the NCS 7516 inclusion and exclusion statement

eIDAS

Since November 2023, SecuMailer has been fully certified for eIDAS REMS. As of July 1, 2024, SecuMailer is listed on the EU trusted list as a trusted provider of QREMS (Qualified Registered Email Service).

ISAE 3000 SOC 2 Type 2

SecuMailer underwent an ISAE 3000 SOC 2 Type 2 audit with no findings or deficiencies. A copy of the certificate is available upon request. The audit report can be viewed in a joint session.

Personal service

It may not make us unique, but it defines us. We don’t work with customer numbers, but with company names and contact persons. Our dedicated team is always here for you, chances are, you’ll speak to the same person each time!

Easily reachable by phone

Have questions? We’re available by phone Monday to Friday from 09:00–17:00! Call us at +31 320 337 381.

Service commitment: uptime 99.95%

We guarantee 99.95% service availability annually, as outlined in our SLA.

Service and support from 9-17

We’re available for phone support on working days from 09:00 to 17:00. Prefer email? No problem, we respond quickly! Reach us at service@secumailer.com.

Self-service portal

As a customer, you’ll have access to our self-service portal, where you’ll find: Frequently Asked Questions Release Notes SLA Reports User Guides

Monthly SLA reports

Our SLA includes promises to our customers. Each month, a report is available in the self-service portal showing how we’re meeting those commitments.

Proven across sectors where every delivery counts

Government & Municipalities

Communicate confidentially with citizens, departments, and partners, fully compliant with GDPR. Align with eIDAS requirements for legally registered digital delivery, with full traceability. SecuMailer delivers secure messages directly to the recipient’s inbox: a simple and secure way to share sensitive decisions, notifications, and documents. It’s secure, accessible communication without barriers.

Healthcare providers

Send patient records, referrals, and lab results securely and in full compliance with NTA 7516 and GDPR. SecuMailer integrates with your EHR system and enables secure email that meets healthcare standards ensuring interoperability across organizations. Need to reach a patient? Your message arrives directly in their inbox: no portals, no repeated logins, just secure and accessible communication.

Legal professionals

Communicate confidentially with clients, courts, and legal partners fully compliant with GDPR. Need legal proof of delivery? SecuMailer supports eIDAS-compliant registered email, ensuring full traceability and legal validity. For regular confidential messages: secure emails arrive directly in the inbox, with no portals or logins required. A flexible solution for both formal and everyday legal correspondence.

Financial institutions

Send sensitive documents like payslips, tax returns, or financial statements securely and GDPR-compliant. With SecuMailer, you reach clients directly in their inbox, without requiring a portal or login. Need legal proof of delivery? Our eIDAS-compliant registered mail gives you full traceability. It’s professional, secure communication made simple for both you and your clients.

Business Services

Whether you're sending contracts, proposals, reports, or personal data, SecuMailer ensures your emails are secure and fully GDPR-compliant. Messages are encrypted and delivered straight to the recipient’s inbox, without requiring portals, accounts, or logins. It’s a professional, accessible way to protect sensitive communication and strengthen trust with your clients.

Housing & Property Management

Send rent contracts, payment reminders, or tenant communications securely and in full compliance with GDPR. SecuMailer lets you reach tenants and partners directly in their inbox. Need legal proof of delivery? Use our eIDAS-compliant registered email with full traceability.

It’s just like registered mail – but it works like email.

Ditch the paper. Send instantly. Stay legally covered.
With eIDAS Qualified Registered Email, you ensure that your critical communications are delivered instantly, securely, and with full legal validity.

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See how easy secure emailing can be

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SecuMailer

Navigating to security – why customers switched to Secumailer

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REST API

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