Vonage Desktop App: Sending faxes by Email Sign into the email account you designated as your Fax Email Address. Attach fax to the email, where supported types include: Word, Excel, PDF, TIFF, and all image types. TIFF is recommended. Send email to to the targeted fax number: 1 + <10-digit phone number>@fax.vonagebusiness.com.For example, to send a fax to 732-555-1212, address the email to 7325551212@fax.vonagebusiness.com.NOTE: Faxes sent by email are not HITRUST or HIPPA compliant. Receive confirmation of the sent fax in the Inbox of the email account associated with the fax line.