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Fax remains a common channel in Spain for communicating with government offices, banks, legal firms, and healthcare providers. Many Spanish public institutions — including the tax authority (Agencia Tributaria), social security offices, and courts — accept fax as a valid form of document submission. Banks and insurance companies in Spain also use fax routinely for processing forms, claims, and signed authorizations.

If a Spanish organization lists a fax number alongside their phone and email, it is usually because they actively monitor it and expect to receive documents that way.

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