Validate a form?
<p>I wonder if it's necessary to search an e-mail adress input value from a form for "Content-type", "Bcc" and "Cc" or is the FILTER_SANITIZE_EMAIL enough?</p>

<p>I also wonder if it's enough to use FILTER_SANITIZE_STRING from input values like a name and a textarea?</p>

<p>Thanks!</p>
