A notificación fehaciente is a notice you can prove, if anyone disputes it, reached the recipient, on what date and with what content. The law gives no closed list of methods: courts decide. A notary's deed and a burofax (Correos' urgent delivery against signature) with a certified copy are the safest; a registered letter with acknowledgement of receipt proves delivery but not content; and an email can work if it was agreed or is the usual channel.
What does "fehaciente" mean in a notice?
Many Spanish laws ask for notice "de forma fehaciente" or "por cualquier medio fehaciente" (in a reliable, provable way), but none defines the word in general. The courts have done it.
The Supreme Court (Tribunal Supremo), in judgment 493/2022 of 22 June, explained it like this when dealing with a demand for rent: it must be made "de manera fehaciente a través de un medio que permita dejar constancia de su realización. Dicho de otra forma, que dé crédito a la realidad de su práctica" (in a reliable way, through a means that leaves a record that it was done; in other words, that makes it credible that it really happened). The Murcia Provincial Court quotes it word for word in its order 72/2026.
The Provincial Courts (Audiencias Provinciales, the appeal courts for each province) apply the same idea. Barcelona, in its order 375/2026, sums it up in one line: "ha de quedar constancia de su envío y de su recepción (fehacencia)" (there must be a record of its sending and its receipt). Alicante, in its judgment 296/2026, points out that "El Tribunal Supremo no exige forma especial tan solo que exista fehaciencia" (the Supreme Court does not require any special form, only that it be reliably proven).
For public authorities there is a written list, and it works as a guide for anyone. Article 41.1 of Law 39/2015 (on administrative procedure) treats a notice as valid if it leaves a record of:
- Sending or making it available.
- Receipt or access by the person concerned.
- The dates and times.
- The full content.
- The identity of the sender and the recipient.
If your method records those five things, you are close to what a judge understands by fehaciente.
Which methods count? At a glance
| Method | Proves the content? | Proves delivery and date? | Indicative cost (October 2026) | When to use it |
|---|---|---|---|---|
| Notary's deed (acta notarial) | Yes, the notice carries the literal text | Yes, recorded by the notary | Set by the notaries' fee scale | The law requires it, or a lot is at stake |
| Burofax with certified copy and acknowledgement | Yes | Yes | €32.01 online or €36.02 at a post office, one page | The general case |
| Registered letter with acknowledgement of receipt | No | Yes | €8.64 | When nobody will dispute the text |
| Qualified electronic registered delivery (eIDAS) | Integrity is presumed | Sending, receipt and date are presumed | Depends on the provider | There is an agreed or usual email address |
| Non-qualified email with evidence, plain email, WhatsApp | The judge weighs it | The judge weighs it | Varies | Usual channel or second channel |
Correos prices are from its 2026 price list for mainland Spain and the Balearics, VAT included: burofax online €8.71, at a post office €12.72, certified copy €17.55, acknowledgement of receipt €5.75, standard registered letter up to 20 g €5.74 and its acknowledgement of receipt €2.90.
How does a notary's notice work?
It is the most formal method, because the notary carries out the delivery and records it in the deed. The Notarial Regulations (Reglamento Notarial) cover it in articles 202 to 206.
- What it is. A notice deed serves to "transmitir a una persona una información o una decisión" (pass on information or a decision to someone); a demand deed (requerimiento) also serves to "intimar al requerido para que adopte una determinada conducta" (formally call on the recipient to act in a certain way) (art. 202). If you want the other side to pay, hand something over or do something, it is a demand.
- How it is delivered. The notary can send the notice by registered post with acknowledgement of receipt, or go in person to the address you give. If the recipient is not there, anyone present who identifies themselves can take it, or the building's porter.
- What it contains. The notice contains "el texto literal de la notificación o el requerimiento" (the literal text of the notice or demand) and tells the recipient of their right to reply.
- If it cannot be delivered. The notary sends it by registered post with acknowledgement of receipt "o por cualquier otro procedimiento que permita dejar constancia fehaciente de la entrega" (or by any other procedure that leaves reliable proof of delivery).
- If the recipient refuses. When the person concerned or their representative refuses to take it, this is recorded "y se tendrá por realizada la notificación" (and the notice will be treated as given) (art. 203).
- Right to reply. The recipient can reply in the same deed within the following two working days (art. 204).
The cost is set by the notaries' fee scale (arancel) and depends on the copies, the pages and whether the notary has to travel. Ask the notary's office for a quote first.
Why is the burofax the most used method?
Because it is much cheaper than a notary and the courts accept it as solid evidence. In the same judgment 493/2022, the Supreme Court said that "el burofax remitido es un instrumento idóneo" (the burofax sent is a suitable instrument) because it "acredita el contenido literal de la comunicación enviada, así como la identidad del remitente, del destinatario, del lugar o domicilio al que se dirige, así como el resultado de la entrega" (proves the literal content, the identity of the sender and the recipient, the address it went to, and the result of delivery).
Two important points:
- Order the certified copy (copia certificada). It is what proves what the burofax said. It costs €17.55 if you order it when sending, and the Burofax Premium page says it has "validez legal frente a terceros" (legal validity against third parties).
- It is only worth what Correos certifies. In Alicante judgment 296/2026, an uncollected burofax was not enough: Correos certified that it was not collected from the post office, but not that a notice had been left; the property had no letterbox, and the item did not include the invoices being claimed. The court did not deny "en abstracto la validez del burofax como medio fehaciente" (in the abstract, the validity of the burofax as a reliable means), but that particular burofax did not work.
One legal detail worth knowing: the postal services Law 43/2010 gives Correos, as the designated operator, the "presunción de veracidad y fehaciencia" (presumption of truthfulness and reliability) for notices from administrative and judicial bodies (art. 22.4). That presumption is designed for notices from courts and authorities. Between private parties, a burofax is valued mainly for what Correos certifies and how the courts assess it, which, as we have seen, is favourably.
Does a registered letter with acknowledgement of receipt count?
It proves it arrived and when, but not what was inside. Correos itself says so in its comparison of registered letter and burofax: the registered letter (carta certificada) "no certifica el contenido de la carta" (does not certify the content of the letter), although it does offer "trazabilidad completa del envío y prueba de entrega" (full tracking and proof of delivery).
The risk is obvious: if the recipient says the envelope was empty or contained something else, you cannot prove otherwise. It works for communications whose content nobody will dispute. If the recipient is out, Correos leaves a notice so it can be collected from the post office within 15 days, according to its registered letter page.
Can an email be fehaciente?
It depends on three things: whether you agreed it, what kind of service you use, and whether the recipient really uses that address.
If you agreed it in a lease. The Urban Leases Act (Ley de Arrendamientos Urbanos, LAU) lets the parties name an email address for notices under the Act, "siempre que se garantice la autenticidad de la comunicación y de su contenido y quede constancia fehaciente de la remisión y recepción íntegras y del momento en que se hicieron" (provided the authenticity of the communication and its content is guaranteed, and there is reliable proof of the full sending and receipt and of when they happened) (art. 4.6). The agreed email works, but you must be able to prove those facts.
If you use a qualified service. The EU eIDAS Regulation distinguishes two kinds of electronic registered delivery. Data sent through a qualified service enjoy a presumption of integrity, sending by the identified sender, receipt by the identified recipient and accuracy of the date and time (art. 43.2 eIDAS). The Civil Procedure Act (Ley de Enjuiciamiento Civil, LEC) strengthens that presumption if the service was on the trusted list at the relevant time (art. 326.4). You can check which providers offer that service in the official EU trusted list browser, filtering by service type and country.
If you use a non-qualified service or a plain email. It cannot be denied value "por el mero hecho de que estén en formato electrónico o no cumplan los requisitos de servicio cualificado de entrega electrónica certificada" (solely because it is electronic or does not meet the requirements of a qualified service) (art. 43.1 eIDAS), but there is no presumption: if the other side challenges it, the judge weighs it with the rest of the evidence (art. 326.3 LEC). In practice, courts look above all at whether it was a real channel between the parties:
- The Tarragona Provincial Court, in its judgment 896/2026, held that a rent update sent by email had been communicated, even though the contract named a physical address, because email was the "cauce ordinario de comunicación contractual" (ordinary channel of communication under the contract). It weighed that a witness who worked for the tenant company's director admitted at trial receiving the emails, downloading the documents and forwarding them to the accountants.
- The Teruel Provincial Court, in its judgment 89/2026, rejected the argument that email "no es un medio fehaciente" (is not a reliable means) when it was the claimant who had asked for the documents to be sent to their own lawyer's email, and the lawyer replied a few days later. The lack of a read receipt did not matter: "Ergo, recibió el correo" (so the email was received).
- For the attempt to negotiate before filing a claim (MASC), the presidents of the civil sections of the Barcelona Provincial Court accept "correo postal con acuse de recibo, burofax, buro-mail o email, WhatsApp, así como cualesquiera otros medios que permitan dejar constancia del envío y de su recepción" (post with acknowledgement of receipt, burofax, buro-mail or email, WhatsApp, and any other means that leaves a record of sending and receipt), as set out in its order 375/2026. We explain this in MASC by certified email.
The practical conclusion: an email can be enough as evidence when it is the agreed or usual channel and you can prove it arrived and was read. When it is not, or the law expressly asks for a reliable means and you expect a dispute, the prudent choice is still a burofax or a notary.
Which laws require a fehaciente notice?
These are some of the most common in business and property management:
| Law | What it requires |
|---|---|
| Urban Leases Act, art. 25 | Notify the tenant "en forma fehaciente" of the decision to sell, the price and the terms; after the sale, the buyer must notify the tenant of the terms it was made on |
| Urban Leases Act, art. 32.4 | Notify the landlord "de forma fehaciente" of an assignment or sublet of premises used for a business or professional activity, within one month |
| Urban Leases Act, art. 4.6 | Agreed email address, with "constancia fehaciente de la remisión y recepción íntegras" (reliable proof of full sending and receipt) |
| Civil Procedure Act, art. 22.4 | Demand payment from the tenant "por cualquier medio fehaciente" at least thirty days in advance, so they cannot stop the eviction by paying |
| Horizontal Property Act (Ley de Propiedad Horizontal), art. 7.2 | A claim to stop prohibited activities must come with "acreditación del requerimiento fehaciente al infractor" (proof of the reliable demand to the offender) |
| Horizontal Property Act, art. 9.1.h and i | Owners give their address for notices, and any change of ownership, "por cualquier medio que permita tener constancia de su recepción" (by any means that leaves a record of receipt) |
| Civil Code (Código Civil), art. 1504 | In property sales, the demand to the buyer is made "judicialmente o por acta notarial" (through the courts or by notarial deed) |
| Organic Law 1/2025, art. 10.2 | For MASC, a document proving receipt, the date and access to the full content |
Notice the difference. When the law says fehaciente and nothing more, you can choose the method. When it names one, like article 1504 of the Civil Code, the burofax is not on the list. And when the law does not ask for it, the rules change: in its judgment 861/2026 of 4 June, the Supreme Court pointed out that for neighbouring landowners' pre-emption rights the Civil Code (art. 1524) "no contiene la obligación de notificación fehaciente" (contains no obligation of reliable notice), unlike the right of a tenant of a home or premises (arts. 25 and 31 of the Urban Leases Act). So, in that case, the deadline ran from the registration of the sale in the Land Registry.
This summary is based on national (state) law. If your case is governed by a region's own civil law, check that law too.
What if the recipient does not collect it or refuses it?
They cannot escape it just by not opening the door. The Supreme Court, in judgment 493/2022 as cited by the Murcia court, held that "Los actos de comunicación producen efectos cuando su frustración se debe, únicamente, a la voluntad expresa o tácita de su destinatario, o a la pasividad, desinterés, negligencia, error, o impericia de la persona a la que va destinada" (communications take effect when they fail only because of the recipient's express or tacit will, or their passivity, lack of interest, negligence, error or lack of skill). And it added: "No es posible que la eficacia de un acto jurídico penda de la voluntad del requerido" (the effect of a legal act cannot depend on the will of the person it is addressed to).
The condition is that the notice was correctly addressed. In that case, the burofax "no se remitió a domicilio erróneo, o en el que el demandado fuese desconocido" (was not sent to a wrong address, or one where the defendant was unknown), and Correos left a notice. With a notary it is similar: if the person concerned refuses to take the notice, it is treated as given (art. 203 of the Notarial Regulations). For what each Correos result means, see burofax refused or not collected.
How do I choose the method?
- Read the law and the contract. If the law names a method (like the notarial deed in article 1504 of the Civil Code) or the contract sets one, use it.
- If it just says fehaciente, send a burofax with a certified copy and acknowledgement of receipt. If there is a lot of money at stake or you expect a long dispute, consider a notary's deed.
- Use the right address. The one the recipient designated, the one in the contract or the one on record with the community of owners. Courts give effect to an uncollected notice when it was correctly addressed, not when it went to the wrong address.
- Include all the content. If the law requires specific details, like the price and terms under article 25 of the Urban Leases Act, an incomplete notice may not work.
- Add a second channel if the recipient uses email with you. It does not replace the burofax, but it adds evidence.
- Keep the receipts and count deadlines from the date of receipt shown on them.
For that second channel we build a certified email service. It sends the document from your own domain and records, for each recipient, delivery, opening and download with date, time and IP address, with a SHA-256 fingerprint of the document that can be checked on a public page. Opening is indicative; the download is the strong evidence. It is not a qualified eIDAS service nor a fehaciente notice, and it does not replace a burofax: it is electronic evidence that a judge weighs freely if it is disputed.
Frequently asked questions
Is a WhatsApp message a fehaciente notice?
It has no legal presumption. For the attempt to negotiate before a claim, the Barcelona Provincial Court accepts it if it leaves a record of sending and receipt and uses an electronic channel the parties agreed or used before. Outside that, it depends on proving the number belongs to the recipient and that they received it.
Is a burofax that the recipient does not collect still fehaciente?
Usually yes, if it went to the right address and Correos left a notice: the Supreme Court does not let the effect of a notice depend on the will of the person avoiding it. But it has to appear in the Correos certification; in the Alicante case, with no proven notice and no letterbox, it did not work.
What is the difference between a notice and a demand?
A notice (notificación) passes on information or a decision. A demand (requerimiento) also calls on the recipient to do something, such as pay or hand over premises. Article 202 of the Notarial Regulations draws this distinction.
How much does a fehaciente notice cost?
A one-page burofax with a certified copy and acknowledgement of receipt costs €32.01 online or €36.02 at a post office, as of October 2026 (mainland Spain and the Balearics, VAT included). A notary's deed depends on the fee scale, the copies and whether the notary has to travel.
Does an email need a read receipt to count?
It is neither essential nor enough on its own. In the Teruel case, the court accepted an email without a read receipt because the recipient had asked for that channel and their lawyer replied a few days later. What matters is being able to prove it reached a real channel of the recipient and that they could read it.
Sources
- Notarial Regulations (Reglamento Notarial, Decree of 2 June 1944), arts. 202 to 206.
- Royal Decree 1426/1989, notaries' fee scale (Arancel de los Notarios).
- Law 39/2015, on common administrative procedure, art. 41.1.
- Law 43/2010, on the universal postal service, art. 22.4.
- Urban Leases Act (Ley 29/1994, de Arrendamientos Urbanos), arts. 4.6, 25 and 32.4.
- Civil Procedure Act (Ley 1/2000, de Enjuiciamiento Civil), arts. 22.4 and 326.
- Horizontal Property Act (Ley 49/1960, de Propiedad Horizontal), arts. 7.2 and 9.1.
- Civil Code (Código Civil), art. 1504.
- Organic Law 1/2025 (Ley Orgánica 1/2025), art. 10.2.
- Regulation (EU) 910/2014 (eIDAS), art. 43, unchanged in the EUR-Lex consolidated version.
- EU trusted lists (eIDAS Dashboard).
- Supreme Court, Civil Chamber, judgment 861/2026 of 4 June.
- Murcia Provincial Court, Section 4, order 72/2026, which cites Supreme Court judgments 493/2022 of 22 June and 633/2022 of 29 September.
- Barcelona Provincial Court, Section 13, order 375/2026.
- Alicante Provincial Court, Section 5, judgment 296/2026.
- Tarragona Provincial Court, Section 3, judgment 896/2026.
- Teruel Provincial Court, Section 1, judgment 89/2026.
- Correos: 2026 price list for mainland Spain and the Balearics, Burofax Premium, registered letter and registered letter or burofax.
This article explains the law and published court criteria as of the update date. It is not a substitute for advice from a lawyer on a specific case.