easier fax to mail ?

[Xavier Cardil <cardil.xavier@gmail.com>]

Hi, we want to improve our fax to mail application now, by making only the customer to send an email with a pdf and a subject. Then when the mail arrives to the inbox, we want to analyse it, and then create an application to create the fax to mail, using only the content of the pdf file and the subject as a reference.
Do you know where can whe start ? How can I analise an incoming e-mail ? 

Thank you.