A lot of programmers did not specify the reply to email address during the programming of the Form to Email scripts, as a result, the form to email may appear to be send from for egme@localhost.com.
This can easily fail the Spam Filters of a lot of email services. In such situation, it would be better to program the Form to Email with a valid header and Reply to Address.
A worse scenario will be to allow Trusted User in our Smarter Mail as me@localhost.com. This will enable your email server to receive the Form to Email without being trapped by the Spam Filters.