yes you can send via email...sending via fax usually requires a an email link to an auhtorized fax site and the setting up of an account...
you need to use the MIME functionality of the SMTP program....
I have attached a zip file with some code samples from the php programming book by wrox press to help you...haven't looked at which one is needed so you will have to sort through the samples to get the correct ones...
hth