A method for a computer system includes receiving a fax from a user comprising a digitized document and a billing telephone number associated with the user, wherein the digitized document includes a digitized transmission page including a digitized recipient e-mail address, and wherein a receiving number over which the fax is received is associated with a pay-per-use service, optically recognizing characters of the recipient e-mail address from the digitized e-mail address, determining an attachment in a format suitable for attachment to an e-mail message from the digitized document, sending an e-mail message comprising an e-mail attachment portion including the attachment, an e-mail TO portion including the recipient e-mail address, and an e-mail body portion including a service provider identifier, and submitting a service charge associated with the pay-per-use service against the billing telephone number.