I have found if you create and send a standard Word Document through the Exetel email2fax gateway it works fine and sends a great quality fax.
Problems occur when sending scanned documents as the quality of the received fax can be atrocious.
These are the steps I used under Linux to provide a decent quality of PDF to send as an attachment via the Exetel email2fax gateway. (This is from trial and error so there may be improvements still to be had).
- Using XSane
- If it’s multiple pages set xsane to scan to “multipage”
- Select 300DPI “Line Art” (Not colour or grayscale)
- Scan your pages and save as PDF.
Problems: If the resulting PDF is over about 4MB it will expand (by about 134%) and get rejected by the email2fax gateway, so check it before you send. To get a smaller PDF I saved the multipage xsane output as Postscript and then converted to PDF using ps2pdf which made a smaller PDF size (and it reduces quality so check it before sending an important fax!)