Certified SMS
Send messages with complete security and legal backing in a matter of seconds. Ensure delivery, protect your communications, and guarantee their legal validity with the best option on the market.
+10,000 SMS messages sent daily
Our Certified SMS Service Allows You to:
- Possess a legal certificate as proof: The certificate issued by Legalpin, a trusted third party registered with the Ministry of Industry, has full legal validity in court as proof of reliable notification.
- Save time and costs: Streamline processes, reduce costs compared to traditional methods, and avoid unnecessary travel.
- Provide valid evidence in your applications for VAT recovery on unpaid invoices.
DIGITAL SOLUTIONS
FOR YOUR COMPANY
What is a Certified SMS?
A Certified SMS is a text message that meets the highest standards of security and legal validity. Unlike a conventional SMS, the Certified SMS guarantees the identity of the sender and the recipient, as well as the integrity of the content.
What Can You Send with Legalpin’s Certified SMS?
- Appointment or important event reminders.
- Overdue payment notices.
- Meeting or board meeting announcements.
- Change or update notifications.
- Order or delivery confirmations.
- Urgent communications to employees, partners, or clients.
How is a Certified SMS Sent?
With Legalpin, sending a certified SMS is very simple:
- Draft a simple email with the text of the SMS you want to send.
- Send it to an email address provided by Legalpin.
- Tell us the recipient’s phone number and send it!
- It’s that easy!
And that’s it! This simple and fast way you can protect every document, contract, signature, notification or electronic invoice that you send through Legalpin.
Does the Certified SMS Have Legal Validity as Proof of Reliable Notification?
Legalpin’s Certified SMS has the same legal validity as a Burofax as proof of reliable notification. This is because, in addition to complying with the legal requirements of a conventional SMS, the Certified SMS incorporates additional information that proves the identity of the sender and recipient, as well as the integrity of the content.
Unsure if your current communication is valid?
We can help you evaluate it
Could you prove in court that you sent that claim?
A normal SMS has no probative value. The certified SMS generates irrefutable evidence.
Does your current system prove that the recipient received and read the message?
Standard read receipts are not legally valid. Our certificate is.
Do you have a record of the exact content you sent?
Messages can be altered. Our system guarantees the integrity of the content.
Your Communication is Legally Valid if:
Try it FREE for 7 Days
If you have ever used other certified digital messaging services, or if you have never done it yet, we want you to try our services. That is why we want you to be able to use the services 7 free days so you can see how simple it is to send any encrypted and certified notification from your usual email, without installations, without problems, without cost.
4 Clear and practical benefits of Certified SMS
We translate legality into real advantages: more security, fewer costs, and zero friction.
Immediate savings
Reduces up to 80% of the cost compared to burofax.
No travel, no waiting: everything from your mobile.
Legal validity in ES and EU
Complies with eIDAS and Law 6/2020.
Certificates signed and time-stamped, accepted by courts.
No additional apps
Works with any mobile phone.
Send from your usual platform and you're done. Onboarding in minutes.
Immediate certificate
Receive a PDF with sending, delivery, reading and full content.
Includes date, time, destination number and proof of reading.
Use cases for Certified SMS
Real scenarios where Legalpin simplifies and protects your mobile communications.
Lawyers and Law Firms
Urgent extrajudicial notifications with immediate proof of delivery. You send from your usual email,
the recipient receives an SMS and you instantly get a PDF certificate with full content.
Ideal for urgent summons, deadline reminders or communications with clients.
Even if the message is not opened, you can prove the provision and meet legal deadlines.
Result: procedural agility and reduced costs vs traditional methods.
Companies and Departments
Communicate payment reminders, contractual changes, labor sanctions or urgent notices with
complete traceability.
Each SMS is backed by a certified PDF that records
date, time, destination number and original content. It works from your usual platform, without extra apps:
guaranteed regulatory compliance, fewer disputes and immediate response from the recipient.
Individuals and Freelancers
Claim from suppliers, defaulting clients or services with a notification that does leave legal record.
You send from your email, the recipient receives an SMS and you get reliable proof that activates legal deadlines
and neutralizes the "I didn't receive anything".
All without travel, with a much lower cost than burofax and immediate legal validity
when you need it. Perfect for communications that can't wait.
From your usual email · No additional apps
Send your first certified SMS today
- Reliable proof: sending, delivery, and content.
- Legal validity: eIDAS · Law 6/2020.
- Total immediacy with legal backing.
Response on the same day
Comparison: Normal SMS vs Certified SMS vs Burofax
A clear vision to decide with speed, cost and legal security.
Instant sending, but without reliable record of sending, delivery or content.
If there is a dispute, speed does not help.
Immediate sending with automatic certificate (date and time, delivery to the recipient's device and full content).
Ideal for urgent communications with legal validity.
You depend on the operator and the physical distribution.
In practice it is slower and subject to time slots.
Apparent low cost, but if you need legal validity you will end up resorting to expert reports or resending by another means.
Result: expensive afterwards.
Much lower than burofax and with legal proof included.
A single sending serves as reliable notification and electronic evidence.
High: sending, delivery attempts, acknowledgment and second steps.
It scales badly when you make many communications.
Limited: does not reliably prove who sent what, when and to whom.
Usually requires expert evidence.
Reinforced validity: documents sender, recipient, sending, delivery/provision and full content.
Signed and time-stamped, suitable for courts and organizations.
Historically accepted as reliable notification,
although without digital metadata as detailed as the certified SMS.
Very easy, but without legal traceability or proof of what is relevant.
You send from your usual email: you draft the SMS and add Legalpin in copy.
No additional apps or process changes.
More cumbersome: external platform or physical office.
Specific steps and management schedules.
Does not record useful metadata (destination number, original content, time stamp, content hash) for audit or trial.
Complete traceability: PDF certificate with content hash, time stamp, destination number and timeline (sending, delivery and, if applicable, reading).
Provides acknowledgment and proof of delivery,
but without the technical detail of a certified digital chain.
Informal or operational communications where legal validity is not critical.
Urgent notifications, unpaid claims, legal reminders,
immediate summons, communications with clients/suppliers and requirements with tight deadlines.
Residual scenarios where postal sending is required
or the recipient only accepts physical delivery.
How Certified SMS works
In 4 simple steps, turn your text messages into legal evidence with legal validity.
You draft from your email
You write the text message from your usual email client (Outlook, Gmail, etc.). You include Legalpin in copy and specify the destination phone number.
Legalpin processes and certifies
Our platform converts your text into SMS, applies end-to-end encryption and records all metadata: date, time, IP, servers and full content.
Delivery to the recipient
The message reaches the recipient's mobile phone as a normal SMS. If it cannot be delivered (phone off, network error), the system records the failure.
You receive the PDF certificate
You automatically get a signed and sealed PDF certificate with: full content, date/time of sending and delivery, destination number and proof of reading if possible.
Guaranteed legal validity
Complies with eIDAS and Law 6/2020, accepted by Spanish and EU courts.
No additional apps
Works from your usual email, without installing software.
End-to-end encryption
Your messages are protected with the highest security standards.
Myths vs Realities
We debunk misconceptions about Certified SMS
"A normal SMS is already valid as proof"
Without certification, there is no guarantee of integrity, authorship or delivery of the message.
Only the certificate has legal validity
Includes time stamp, cryptographic hash and delivery certificate.
"It's complicated to use"
It is believed to require special apps or changes in processes.
It works from your usual email
You send from Outlook/Gmail, add Legalpin in copy and you're done.
"Burofax is safer"
The paper-based tradition seems more reliable.
Greater traceability than burofax
80% more economical, immediate delivery and certified full content.
Security, compliance, and audits
Each certified SMS complies with European and Spanish frameworks to guarantee legal probative value. We apply end-to-end encryption, access controls and immutable custody that protect the integrity and privacy of your mobile communications.
Regulations and specific compliance
- eIDAS: qualified time stamping and electronic evidence for SMS in the EU.
- GDPR and LOPDGDD: secure processing of telephone numbers and message content.
- Telecommunications Law 9/2014: compliance in electronic communications.
- Privacy by default: minimization of data in each certified SMS.
Encryption and message protection
- Encryption in transit with TLS 1.3 for secure transmission.
- Encryption at rest of messages and metadata with segregation by client.
- Unique hash of the content of each SMS to guarantee integrity.
- Qualified time stamp for legal validity in court.
- WORM-type immutable custody for defined legal periods.
Access controls and audit
- Multifactor authentication for access to the platform.
- Access control by roles with the principle of minimum privilege.
- Complete audit logs: sending, delivery and access to certificates.
- Segregation of functions between operators and end users.
- Georedundant backups for service continuity.
Transparency and legal support
- Technical documentation for legal teams and DPO on compliance.
- Secure implementation guides from corporate email.
- Compliance certificates available for internal audits.
- Specialized support for regulatory compliance inquiries.
Security architecture of the Certified SMS
- 1 Drafting from email with TLS encryption
- 2 Content hash and qualified time stamp
- 3 Secure delivery to mobile and immutable custody
- 4 PDF certificate with cryptographic verification
CHOOSE YOUR CERTIFIED SMS PLAN
€144 / Year
CERTIFIED SMS
✓ 80% savings compared to burofax
✓ Send SMS from your usual email
✓ Compatible with Outlook, Gmail and more
✓ 144 certified SMS per year
And also…
✓ Immediate PDF certificate
✓ Legal validity in Spain and the EU
✓ Up to 2 user accounts
✓ 24/7 priority email support
For the other plans, we adapt in a similar way.
€36 / Month
Certified SMS
✓ Certified and encrypted SMS
✓ Send from your corporate email, without installations or complications
✓ Encrypted security with legal validity and GDPR compliance
✓ Encrypted storage of certificates in the cloud
✓ 40 certified SMS per month
And also…
✓ Digital signature from your email
✓ PDF certificate with complete metadata
✓ Up to 5 user accounts
✓ 24/7 support by phone or email
€72 / Month
Certified SMS
✓ Certified and encrypted SMS
✓ Full legal compliance with automatic encryption
✓ Easy integration with corporate platforms
✓ 80 certified SMS per month
And also…
✓ Digital signature from your email
✓ Immediate PDF certificate
✓ Limited user accounts
✓ 24/7 support by phone or email
For the other plans, we adapt in a similar way.
Testimonials
“We have been working with Legalpin for 8 years sending thousands of buromail and certified SMS, and it has become an indispensable service if you need to make claims that serve as proof of reliable notification.”
Gaspar Rodriguez
Law firm founder
“For us, it was essential that the information in the certified mail traveled encrypted because we send health data, and Legalpin is the only company that allowed it to be that way with the buromail service.”
Ana Criado
CEO & founder
“We are very happy in the office with the buromail service, it avoids us having problems with the data protection law because in addition to certifying delivery and reading of the certified mail, it encrypts the content.”
Roberto Lagoa
Lawyer
Frequently Asked Questions about Certified SMS
We answer the most common questions about certified SMS so you can make the best decision.
What happens if the recipient does not receive the SMS?
With certified SMS you can prove the delivery attempt: the certificate records the sending, the attempted delivery to the operator, and the exact content.
If the message cannot be delivered (phone off, out of coverage, incorrect number), the system records this circumstance in the certificate. This also has probative value, as it demonstrates that you made the notification attempt on a specific date and time.
Does it serve as evidence in a civil, commercial, or labor trial?
Yes. The certificate generates electronic documentary evidence with signature and timestamp, which includes sender, recipient, full content, date/time of sending and delivery, and technical traceability (servers, IP, delivery results).
In practice, it allows you to prove prior notifications (claims, summons, contractual communications) and reduce the need for ad hoc expert reports by providing complete and verifiable evidence. (This is not legal advice: the specific use will depend on the case and the criteria of the resolving body.)
Is it valid throughout the European Union?
The service aligns with the certified electronic communication recognized by the European framework, which facilitates its cross-border use as evidence.
The specific procedural admissibility may vary depending on the procedure or country, but the format (signature, timestamp, traceability) is designed to fit with European standards and good practices of eIDAS.
How exactly is it sent from my email?
You don't change tools:
1) Write your message in Gmail, Outlook, or your corporate client.
2) Add the Legalpin address we provide in CC.
3) Send and instantly receive your PDF certificate.
Best practices: include a clear identifier in the subject line and verify that the recipient's phone number is correct.
What does the certificate include and how is it verified?
Includes: sender, recipient, full content of the message, date/time of sending, delivery (or attempt and reason for failure), IP and involved servers, in addition to electronic signature and timestamp.
Verification: any party can verify the integrity of the certificate; the timestamp proves that the evidence existed at that time. You can also download the evidence again from your panel.
Is there a character limit in the message?
The standard SMS supports up to 160 characters in Spanish. For longer messages, the system automatically divides them into several SMS.
Recommendations: keep the message clear and concise, include essential information, and if you need more detail, consider supplementing with a certified email or attaching relevant documents.
What happens if there are technical problems with the recipient's operator?
The system records the technical event: invalid number, unavailable operator, network restrictions, or operator timeouts.
With that trace, you can prove diligence and decide to retry later or change channels. The certificate reflects each attempt and its specific technical result.
Does it comply with GDPR and security?
Yes. We apply encryption, signature, access control, and secure custody of evidence, following principles of minimization and purpose limitation.
You can request the data processing agreement (DPA), review retention policies, and define who within your organization can access the evidence.
How long does it take, how long is it stored, and how do I recover it?
The certificate arrives in seconds after sending. The evidence is stored and you can download it when you need it.
As an internal policy, we recommend archiving a copy in your document manager (with clear name and metadata) for future searches and audits.
When does it make sense to use certified SMS versus certified email?
Certified SMS is ideal when you are looking for immediacy and high probability of reading, especially with recipients who do not frequently check their email.
For more extensive communications or those that require attachments, certified email is still the best option. Certified SMS provides the same evidentiary purpose with faster reception and better open rates.
