FAQ - Frequently Asked Questions

Preguntas Frecuentes

  • ¿Qué es METAPOSTA?

    The METAPOSTA digital mailbox is a secure, private and free channel made up of different solutions that facilitate the reception, signing, filing and legal custody of electronic documents.
    Access to the mailbox is very easy via a browser or the free METAPOSTA App. 
    METAPOSTA is designed for both individuals and organisations, complying with all of Spain's data protection laws.
    With METAPOSTA you can also receive electronic documents from certain issuers such as financial institutions (Laboral Kutxa, Kutxabank) and suppliers of utilities (Amvisa, Consorcio de Aguas de Bilbao…). METAPOSTA also allows you to upload documents of personal interest and sign them electronically, making them valid legally for public authorities. You have up to 1 GB of free space for the documents you upload to your mailbox.
    All the documents stored on METAPOSTA can be accessed from anywhere and at any time.

  • Deseo darme de alta en METAPOSTA. ¿Qué debo hacer?

    To sign up with METAPOSTA, just click on this link:

  • IT TXARTELA: ¿Cómo recupero mis certificados IT TXARTELA obtenidos antes de darme de alta en el buzón de METAPOSTA?

    Once you've created your METAPOSTA virtual mailbox and have associated it with the issuer "Tecnalia - IT TXARTELA", within 24/48 hours you should receive all the certificates you obtained before you signed up. 
    If this is not the case, please contact our CSC (Customer Service Centre).

  • ¿Podré disponer de varios buzones en METAPOSTA?

    No. Each Spanish ID, foreign resident, passport or tax number can only be assigned one METAPOSTA mailbox.

  • Buzón METAPOSTA vs Buzón METABOX

    1- METAPOSTA mailbox

    1.a- Generated directly with METAPOSTA, via our website or the KZgunea centres.

    1.b- You can associate any Issuers that are active and with which you have a relationship (financial institutions, utilities...).

    1.c- You can store your own documentation up to 1 GB.

    2- METABOX mailbox

    2.a- Generated by the company/organisation with which you have a contractual relationship (employee, associate...)

    2.b- That company/organisation can send digital documents to your new mailbox or access your electronic signature, from a mobile device, on any of those documents.

    2.c- You can only receive documents: initially from the Issuer that set up your Metabox and then from other Issuers with which you have a contractual relationship and who have linked to you.

    2.d- You can't upload your own documentation.

    2.e-  You can convert your METABOX mailbox into a METAPOSTA mailbox via the mailbox itself.

  • ¿Puede METAPOSTA ser contratado por menores de edad?

    Yes, as long as they have some form of valid ID (e.g. a Spanish ID card or DNI).

  • ¿Puede METAPOSTA ser contratado por personas extranjeras?

    Yes, as long as they have some form of valid ID to prove their identity (e.g. Spanish foreign resident card or NIE).


  • NIE-DNI: cambiar mi buzón NIE a buzón DNI

    If you already have a METAPOSTA mailbox associated with a foreign resident number (NIE) and you've obtained a Spanish ID number (DNI), and you want to associate your mailbox with your new DNI, please take into account the following steps:

    1- This procedure can only be carried out via the Customer Service Centre (CSC) and you must therefore contact them:

    2- The aim is for each user to have a single METAPOSTA mailbox where they can store all their important documentation.

    3- First download all the documentation you have in your mailbox associated with your NIE so you can upload it to the mailbox associated with your DNI.

    4- Senders: You'll have to re-assign all the Issuers who were associated with your NIE mailbox to your DNI mailbox.

    5- METAPOSTA mailbox vs METABOX mailbox: the procedure is different for each case (see: FAQ METAPOSTA Mailbox vs METABOX Mailbox).

  • ¿Puedo modificar la configuración inicial de mi buzón digital?

    Yes. Via "Set up my account" you can add, delete and modify your personal data and even change your password.

  • ¿Cuál es el límite de capacidad de almacenamiento de METAPOSTA?

    METAPOSTA will have unlimited storage for the documents sent by Participating entities. For any documents you might add, there is a limit of 1GB. If you want to increase this storage limit, please contact us: or 943 000 833.


  • ¿Tienen validez legal los documentos almacenados en METAPOSTA?

    Yes, METAPOSTA is legally valid for all those entities to which Law 11/June 22, 2007 on the electronic access of the public to Public Services is applicable. All public administrations and all private companies to which this law applies must comply with same. For the purpose of the users and entities to which Law 11/2007 applies, everything that occurs in METAPOSTA is legally valid and may be used as a reference or legal evidence.

  • ¿Puedo compartir mi buzón de METAPOSTA con otras personas?

    Yes, you can, but only in the case of sharing documents between METAPOSTA mailboxes.

  • App: ¿cuál es la funcionalidad del botón "validar" de la App al acceder al documento?

    The "Validate" button verifies the validity of the signatures used on the document, via Izenpe.

     It's similar to when you access the "Signature List" tab on the web-based mailbox.

  • ¿Cuánto me costará este servicio?

    It's free to sign up and use a virtual mailbox. Users can also store documents uploaded to the mailbox free of charge up to a limit of 1 GB.

  • CONTRASEÑA: ¿qué debo hacer para regenerar mis claves de acceso a Metaposta?

    To change your password, click on this link:

    It will take you to a screen where you'll be asked for your ID number (DNI or NIE). After clicking on the "I AM NOT A ROBOT" box, you'll be sent a password recovery email via which you can enter the password of your choice.

    There is an intermediate step, in which you'll be asked to confirm that the email address to which the email will be sent is correct and that you have access to it.

    This procedure can also be carried out via the METAPOSTA App.

    Remember that your new password must be at least 8 digits long and contain both letters and numbers.

  • CONTRASEÑA: quiero recuperar la contraseña y me dice que no tengo e_Mail asociado

    Please contact the CSC:

  • CONTRASEÑA: he solicitado el e_Mail para regenerar mi contraseña y no me llega

    Check that it hasn't gone into your Spam or junk mail folder.

    Check that the email address associated with your mailbox is correct.

    And if it's not in your Spam and/or the email address is correct, contact the CSC:

  • ¿Durante cuánto tiempo permanecerán mis documentos almacenados en METAPOSTA?

    The documents you store on METAPOSTA will never be deleted. They will remain stored for consultation and management forever.

  • EMISORES: ¿cómo me suscribo a nuevos Emisores?

    From the "Issuers" option in your mailbox, you can find out which issuers you've already associated, search for issuers and also associate them in order to receive their documents.

  • EMISORES: ¿qué Emisores están activos?

    Active issuers are those from which you can easily and securely receive invoices and communications:

  • EMISORES: ¿qué ocurrirá con mis documentos si dejo de ser cliente de un Emisor?

    Any documents delivered to your letterbox will remain there perpetually, or until you remove them. Logically, due to the fact that you are no longer a client of that entity, no new documents will be delivered to your letterbox.

  • Soy una empresa y deseo darme de alta en METAPOSTA. ¿Qué debo hacer?

    To become a METAPOSTA issuer, click on this link:

  • FIRMA: he recibido un mensaje que me dice que tengo un documento para firmar y no sé cómo hacerlo

    You should click on the link in the SMS/email you received and log in with the same username and password you use to access your METAPOSTA mailbox. If you can't remember any of this information, please contact the CSC:

    You'll access an e-signature site called Metafirma. Once on this site, the signature procedure will vary depending on whether an advanced or basic signature is required.

    To find out how to proceed in both cases, click on the basic and advanced signature video tutorials provided on our website: https:

  • ¿Podré darme de baja en METAPOSTA cuando lo desee, o hay algún periodo de permanencia?

    Yes, you can cancel whenever you want as there's no minimum subscription period for METAPOSTA.

    When you cancel your account with METAPOSTA, all the documents in your mailbox will be deleted. If you want to keep them, you must make a copy before deleting your account.

  • Deseo darme de baja en METAPOSTA. ¿Qué debo hacer?

    In order to deregister from METAPOSTA, you must send, by fax or letter to the headquarters of METAPOSTA, S.A., a revocation application, which must contain the following information:

    • Identity of the account holder.
    • Contact information of the person applying for deregistration.

    The application will be authenticated in accordance with the requirements established in the Declaration of Accounts and Services Practices and METAPOSTA, S.A., who will proceed with the deregistration.

    The authenticated deregistration application as well as information justifying the revocation, is registered and filed.

    Should the revocation be applied for by a person other than the holder, METAPOSTA, S.A. will notify the holder of the account about the application for deregistration and the reasons for this. METAPOSTA, S.A. will not be able to reactivate any account that has previously been deregistered.

    The application can be sent by email and by post mail:

    Parque Tecnológico de Álava
    Avda. Albert Einstein, 44 - Edif. E6 - Bajo
    Miñano Mayor - 01510 Vitoria-Gasteiz


  • Y si no he resuelto mi duda en este apartado de FAQ, ¿cómo puedo resolverla?

    Call or write to METAPOSTA's Customer Service Centre (CSC). Weekdays from 9 a.m. to 7 p.m. More information about the CSC.

Contact us

We'll help you from Monday to Friday from 9 am to 7 pm over any of the following channels:

Follow us on: