T.37
T.37 is an ITU standard which deals with sending fax messages using email. It is also referred to as "Internet fax" or "Store-forward-fax". A fax machine supporting T.37 will send a fax to an email address by converting the document to a TIFF-F image, attaching it to an email (using the MIME format), and sending the document (using SMTP). The destination fax receives the email and prints the attached document. To interface with regular fax machines: