Which font and font size is best for a fax?
Arial 12 is sufficient. It must be ensured that it is easily readable by the recipient.
PDF email is not possible because it is for the court. Legally, email is not recognized as meeting the required form or deadline.
Yeah, that’s enough.
Normal text quality is sufficient – mostly fax machines are now only electronic and it comes as pdf to the recipient.
And if there is actually a real device, it comes to the state of the receiver, i.e. if there is enough toner.
Actually, 10pt should be enough, but with 12pt you are well served. 14pt already looks a bit clobular.