Speaking of conveniences, does anyone use a "free" fax receiving service such as eFax or a "free" transmission service such as FaxZero?

eFax is advertising-driven, but there is a paid version without ads if I recall correctly. FaxZero is all advertising driven as far as I know. Most of the time, when I need to send a fax rather than attaching a document by e-mail, the recipient is a business getting a filled-out authorization or information form from me.

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Banazir