From an email account registered on the Unifax service:
Set the email 'To' address to the recipient fax number in the format of email@example.com where 2127181234 is the destination fax number your email will be sent to.
Supported Email Attachments:
- Images: tiff, pdf, jpeg, gif
- Documents: pdf, rtf, doc, docx, xls, xlsx, html
Attachment size limit: