Free Internet fax service
The advantages of faxing are:
(1) Faster, easier and cheaper than postal mail.
(2) More attention-getting than emails.
(3) Immediate hard-paper copies -- printing is not necessary (if an electronic copy is needed, the document can also be sent by email).
(4) Unlike emails, cannot be blocked.
Conditions and limitations for the free version of the fax service are:
Ad on the cover page
Faxed documents may be plain text or in DOC (MS Word) or PDF format
One file per fax — maximum 3 pages
Maximum 2 free faxes per day (I don't know if this can be expanded by sending faxes from different email addresses from the same computer)
Fax phone numbers with area codes must be ten digits -- i.e., without a "1" prefix. If you include the "1", you will be asked to re-enter the number. Dashes are OK.