It depends on why it was not delivered. If the burofax (a certified postal communication with proof of content and delivery) went to the right address and the recipient refused it or did not collect it after the notice, courts usually accept the attempt to negotiate: the failure is their fault. If it comes back unknown or wrong address, it usually fails unless you prove it was the address the debtor gave you. Otherwise, try another channel.
The underlying rule: what fails through the recipient's fault still counts
Since April 2025, Organic Law 1/2025 has required a prior attempt at an "appropriate means of dispute resolution" (medio adecuado de solución de controversias, MASC) before most civil claims. For a debt, that usually means proving you invited the debtor to negotiate. The question here is what happens when the invitation went by burofax and never reached their hands.
The Supreme Court (Tribunal Supremo) has held that a communication takes effect when it fails to arrive because of the recipient's passivity or lack of diligence (judgment of 22 June 2022). Applying that doctrine, the Barcelona Provincial Court (Audiencia Provincial, the appeal court for each province) has summed up the criterion for the prior negotiation requirement. It is met "cuando la comunicación ha sido correctamente dirigida y puesta a disposición del destinatario, aun cuando éste no la haya recogido" (when the communication was correctly addressed and made available to the recipient, even if they did not collect it).
The key words are "correctamente dirigida" (correctly addressed). It is not enough for Correos, the Spanish postal service, to leave a notice slip in any letterbox. It has to be the debtor's letterbox.
Refused, absent, unknown: not the same thing
| Burofax result | Does it count as an attempt to negotiate? | Why |
|---|---|---|
| Delivered (entregado) | Yes | It proves receipt, date and content |
| Refused (rehusado) | Usually yes | The recipient refused to accept it: the failure is theirs |
| Absent, notice left, not collected (ausente, no recogido) | Usually yes, if the address is correct | It was available to them at the post office |
| Unknown (desconocido) | No | It does not prove that this is their address |
| Wrong address (dirección incorrecta) | No, unless you prove it was the address the debtor designated | In Alicante order 333/2026 it did not count, although the court left that way out open |
That is how the published criteria put it. The Barcelona Provincial Court gives value to the communication once "dejada la advertencia de tenerlo a su disposición en la oficina de correos y no ser recogido por voluntad del destinatario" (a notice was left that it was waiting at the post office, and the recipient chose not to collect it). The Pontevedra court accepts postal items that "aparezcan rehusadas, dejado aviso o devuelto por sobrante; no así cuando el destinatario aparezca como desconocido" (show as refused, notice left or returned unclaimed; but not when the recipient shows as unknown).
In a community of owners, the address that counts is the designated one
For a community of owners (comunidad de propietarios) this has a very concrete practical consequence. The Horizontal Property Act (Ley de Propiedad Horizontal, LPH) requires every owner to give an address in Spain for notices. If they do not, their flat or premises in the building counts instead (article 9.1.h).
The Alicante Provincial Court has applied this to two burofaxes this year:
- In order 322/2026, a burofax came back as "ausente" (absent). Nobody collected it, and it was destroyed. The court allowed the community to put this right by proving that the address was "el comunicado por el deudor a la Comunidad… a efectos de notificaciones" (the one the debtor gave the Community… for notices).
- In order 333/2026, the burofax came back as "dirección incorrecta" (wrong address) and did not count. The court itself pointed out that the failure to receive it "no resultaría necesariamente determinante si se acreditara que la comunicación fue remitida al domicilio designado por el deudor" (would not necessarily be decisive if it were proved that the communication was sent to the address the debtor designated).
The lesson: keep the document in which each owner gave you their address. That is what turns an uncollected burofax into valid proof.
What to do if it comes back as unknown or wrong address
- Check the designated address. Find out which address the owner gave the community and whether the burofax went there.
- Try another channel the debtor uses. An email address they have written to the community from, a phone number they have used to contact you. The Barcelona criteria accept "burofax, buro-mail o email, WhatsApp" and any means that leaves a record of sending and receipt.
- If there is genuinely no way to locate them, the Civil Procedure Act (Ley de Enjuiciamiento Civil, LEC) lets you file a formal signed statement (declaración responsable) explaining why it was not possible (art. 264.4 LEC).
Certified email as a second channel
Certified email does not replace a burofax, but it complements it well. It does not depend on anyone going to the post office, and it records more steps. A good service records delivery to the recipient's mail server, the opening of the message, and the download of the document with date, time and IP address. It also keeps a digital fingerprint of the document, to show it has not changed. Those are exactly the three facts article 10.2 of LO 1/2025 asks for: receipt, date and access to the full content.
It has conditions, and you should know them before you rely on it:
- The channel has to be real. The Alicante courts of first instance accept email agreed as the usual channel, or used for at least three exchanges in the previous six months. The Valencia Provincial Court accepts the one "designado en contrato o el que sea habitual" (named in the contract, or the one normally used).
- A certificate without delivery is worthless. In its order 375/2026, the Barcelona Provincial Court rejected a provider's certificate that showed "Estado DESCONOCIDO" (status UNKNOWN) with no proof of delivery. Your proof has to show that it arrived.
- Not all services are equal in law. Only qualified services under the EU eIDAS Regulation, on the official list, carry a legal presumption of delivery and date. The others, like the one we build, are valid evidence that the judge weighs freely if it is challenged. We explain this in detail in MASC by certified email.
Burofax or email: when to use each
- The debtor uses email with the community: certified email, alongside a burofax if in doubt. It is faster, it does not depend on them collecting it, and it records the download of the document.
- They have never used email, or will probably dispute everything: a burofax to the designated address and, if you can, email too.
- The burofax came back as unknown: look for the designated address and a usual electronic channel before you treat the attempt as impossible.
Using both channels at once costs little and closes almost every door. If one fails, the other holds up the attempt. And in every case, count the thirty calendar days from the date of receipt shown on the proof, not from the date you sent it. With that date, our MASC deadline calculator tells you when the attempt ends without agreement and the last day to file your claim. For the full procedure in a community, see how to claim community fees step by step.
Sources
- Organic Law 1/2025 (Ley Orgánica 1/2025), arts. 5 and 10.
- Law 49/1960, on Horizontal Property (Ley de Propiedad Horizontal), art. 9.
- Civil Procedure Act (Ley de Enjuiciamiento Civil), art. 264.
- Barcelona Provincial Court, Section 14, order 348/2026, which applies the Supreme Court judgment of 22 June 2022 (ECLI:ES:TS:2022:2462).
- Barcelona Provincial Court, Section 13, order 375/2026.
- Alicante Provincial Court, Section 5: order 322/2026 and order 333/2026.
- Agreement of the civil sections of the Pontevedra Provincial Court, 23 January 2026.
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.