Fax cover letter templates are introductory letters that are attached to a fax document before sending it through a fax machine. Basically, they include the details of the sender and the recipient, the total number of pages, and a brief description of the primary document, along with privacy or confidentiality notices. These documents are frequently used to deal with regular documents, invoices, or internal correspondence. Therefore, fax cover letter templates are an eternal part of formal business communication and are