Hello! While looking into this topic, I reviewed the information
https://www.itsecurityguru.org/2025/01/22/is-online-fax-secure-everything-you-need-to-know/
The page explains that online fax services typically rely on encrypted transmission, protected storage, and user authentication. It also highlights audit logs and delivery confirmations, which can support compliance efforts. For regulated sectors, including healthcare under HIPAA, these features help reduce common risks. However, the article also notes that proper configuration and responsible handling of documents remain essential.