eFax Plus® and eFax Pro™ customers can send faxes from up to five (5) email addresses per eFax number at no additional charge.
Send a Fax from Multiple Email Addresses
To add a send email address to your eFax account:
Note: You can do the same for adding email addresses to receive faxes. In step 3 above, in the Preferences tab, just click Edit for the Receive Email Addresses section.