Many industries (healthcare, finance, government, legal) still require or strongly prefer faxes for transmitting documents because fax transmissions are considered legally binding and compliant with privacy/security regulations.

In the U.S., for example, HIPAA (healthcare) and certain banking compliance rules recognize fax as a secure method of document exchange.

Many businesses trust fax as being more tamper-resistant than email attachments, which can be spoofed, altered, or lost in spam filters.

Confirmation receipts provide proof of transmission, which email often lacks in a legally admissible way.

Fax machines (or digital fax services) are deeply integrated into workflows, especially in industries that handle a lot of paperwork — insurance claims, medical records, contracts, government requests.

Replacing these workflows with modern systems can be expensive and disruptive, so organizations continue to rely on faxing as a “good enough” solution.

Faxing works across different systems, geographies, and languages without worrying about file formats or software compatibility.

A fax can be sent from a rural clinic in one country to a hospital in another, even if internet access is unreliable.

Today’s faxing is often cloud-based rather than physical machines. Many companies use “fax to email” services, which feel modern while still satisfying regulatory requirements.

This hybrid model makes faxing easier to keep alive than replacing it entirely.