Unpaid rent
The formal demand a landlord sends before an eviction claim. Sent 30 days before filing, it stops the tenant from halting the eviction by paying at court.
Unpaid rent template →For tenants, landlords, freelancers and businesses in Spain
Send a burofax in Spain online, in English.
A burofax is how formal notice is given in Spain when you need proof: unpaid rent, debts, ending a lease, dismissals. Upload your letter in Spanish or use a template, pay €12.99 once, and the recipient gets it by certified email in minutes. You download a certificate of content, sending, delivery and opening issued by Lleida.net, a trust service provider.
- Certificate of content, sending, delivery and opening
- No digital certificate or electronic DNIe
- One-off payment, no subscription
- 100% online, from anywhere
Good to know: the sending form is in English. Your account area, the emails we send you and the certificate are in Spanish, and the letter itself should be in Spanish because it is addressed to someone in Spain.
The basics
What is a burofax, and why does everyone in Spain ask for one?
In Spain, when something has to be notified “fehacientemente” (in a way that can be proved), people send a burofax. Originally it was a Correos postal service: a letter delivered by hand, with optional proof of delivery and a certified copy of its content.
What a court looks at is the proof: what the letter said, when it was sent and when the other party received it. Lawyers, landlords, employers and letting agents ask for a burofax because many deadlines start from that date: the 30 days before an eviction claim, the four months to stop a lease renewing, the negotiation period before a money claim.
Probalex delivers your letter by certified email and gives you a certificate of all three: content, sending and delivery, plus the moment it is opened.
Use cases
When a burofax is used in Spain
Debts and unpaid invoices
Since 2025, most civil claims in Spain require a prior attempt to negotiate. One letter can demand payment and make a settlement offer, with proof of both.
Debt claim template →Ending a lease
A landlord must notify non-renewal at least four months before the end date, or the lease renews automatically. Tenants also use it to give notice or claim their deposit.
Lease non-renewal template →Dismissals
Spanish employers notify dismissals in writing. When the employee will not sign for the letter in person, a burofax proves the content and the date. Upload your own letter in Spanish.
Complaints and cancellations
Claims against a company, cancelling a service or a contract: a burofax fixes the date of your complaint and what you asked for.
Any formal notice
Whenever you may later need to prove that the other party was told something, on a specific date, with a specific text.
How it works
Four steps, a few minutes
- 1
Prepare the letter
Upload your own PDF written in Spanish, or fill in one of our guided templates: the letter is generated in Spanish for you.
- 2
Add sender and recipient
Your name and DNI, NIE or CIF, and the recipient's name and email address. They appear on a cover page added to your document.
- 3
Pay €12.99 once
Card payment, no subscription. The recipient receives your letter by certified email within minutes.
- 4
Download the certificate
A PDF certificate of content, sending, delivery and opening issued by Lleida.net, a trust service provider. We email you when the recipient opens it.
Pricing
€12.99 for the complete burofax
A burofax is only useful if it proves three things: what was sent, when, and that it was delivered. At Correos those are paid separately; with Probalex they are included.
| Probalex | Postal burofax (Correos) | |
|---|---|---|
| Sending the letter | €12.99, everything included | €8.71 online (first page) or €12.72 at a post office |
| Proof of delivery | Included, with date and time | Acknowledgement of receipt: +€5.75 |
| Certified copy of the content | Included (SHA-256 fingerprint of your document) | Content certification: +€17.55 |
| Opening by the recipient | Recorded when it happens, and we email you | Not available |
| Complete burofax | €12.99 | €32.01 online, with receipt and content certification |
| Delivery time | Minutes, by email | 1 to 2 working days, on paper, by hand |
| What you need | An email address and a card | A Correos online account or a visit to a post office |
Correos prices: official 2026 rates for mainland Spain and the Balearic Islands, VAT included (Burofax Premium online €8.71 for the first page, €12.72 at a post office, acknowledgement of receipt €5.75, content certification €17.55). Probalex price includes VAT. “Burofax” is a registered trademark of Correos and is used here only to describe the type of service.
Built for people who are not in a Spanish post office queue
No digital certificate or electronic DNIe
Spanish government e-services often require a digital certificate. This does not: an email address and a card are enough, for you and for the recipient.
One-off payment
€12.99 per burofax, VAT included. Packs of 5 (€49.99, €9.99 each) or 25 (€199.99, €7.99 each) if you send several. No monthly fee, no trial that turns into a charge.
From anywhere, in minutes
No post office queue and no need to be in Spain. The recipient gets it within minutes, even if they are not at home.
You appear as the sender
Your name and ID number head the document on a cover page, with the recipient's details and the document's SHA-256 fingerprint.
Templates
Spanish letters, explained in English
Fill in the details and the letter is generated in Spanish, ready to send.
For landlords of residential property in Spain
Unpaid rent demand letter
Requerimiento de pago de rentas impagadas previo al desahucio
For freelancers, small businesses and individuals owed money in Spain
Debt claim with a pre-litigation negotiation offer
Reclamación de deuda con propuesta de negociación previa (MASC)
For landlords of residential property in Spain
Lease non-renewal notice from the landlord
Comunicación de no renovación del contrato de alquiler de vivienda (arrendador)
Template for guidance only. We recommend review by a lawyer before sending.
Frequently asked questions
Does the letter have to be in Spanish?
If the recipient is in Spain, we recommend it: the certificate is issued in Spain and a burofax is meant to be used before Spanish courts and authorities, where a document in another language may need a sworn translation. Our templates generate the letter in Spanish. If you upload your own PDF, write it in Spanish.
What if the recipient has no email address?
Probalex delivers by certified email, so you need the recipient's email address. If you only have a postal address, the right channel is a postal burofax from Correos or another postal operator. We do not send paper letters.
Can I send it from outside Spain?
Yes. Everything happens online and you pay by card, so you can send it from anywhere. The form asks for your name and your DNI, NIE or CIF, which appear on the cover page together with the recipient's details.
What proof do I get?
A PDF certificate issued by Lleida.net, a trust service provider, that includes the document you sent, its SHA-256 fingerprint, and the dates and times of sending, delivery and, when it happens, opening. It is the document you would submit as evidence if there is a dispute.
What if the recipient never opens it?
Not opening it does not stop the process: the certificate records the content and the sending, and the opening is added only if it happens. Whether the notice is considered received in your case depends on the circumstances, so ask a lawyer if it matters.
Is the whole website in English?
The pages and the sending form are in English. Your account area (Mis envíos), the emails we send you, the cover page and the certificate are in Spanish, because the burofax is addressed to someone in Spain. If you get stuck, write to us in English.
Another question? Write to us in English at hola@probalex.com.
Send your burofax in the next few minutes.
No queues, no post office, no digital certificate. €12.99, paid once.