Some customers choose to receive their leads (list) via Fax.
You may choose to receive yours by fax as well.
Consider this is preferred for businesses who conduct door-to-door or over-the-phone type of sales, as this list format does not lend itself to direct mail, but rather to tasking people with physically visiting new homeowner properties or calling them in order to pitch their products and services.
This shows a sample of what such faxed list looks like.