Mail form blues

[dynamically_not]

All of a sudden my mailform has stopped working. I do receive the emails from the form, but no text within- just blank...
It was all of a sudden, no changes were made my side, so im guessing its server side? any idea's?



<form method="post" action="contact.php">
<table border="0" cellspacing="0" cellpadding="0" class="small_txt">
<tr>
<td width="150"><font size="2" class="small_txt"><b>Your Name: </b></font></td>
<td><font size="2">
<input type="text" class="small_txt" name="user_name" size="50" />
</font></td>
</tr>
<tr>
<td width="150"><font size="2" class="small_txt"><b>Your Email
address: </b></font></td>
<td><font size="2">
<input type="text" class="small_txt" name="email_from" size="50" />
</font></td>
</tr>
<tr>
<td width="150"><font size="2" class="small_txt"><b>Your Message: </b></font><br />
<span class="style6">*don't forget to leave us a phone number so we may contact you if necessary.</span></td>
<td><font size="2">
<textarea rows="5" cols="49" name="email_message" class="small_txt"></textarea>
</font></td>
</tr>
</table>
<p><font size="2">
<input type="submit" value="Submit" class="small_txt" />
</font></p>
</form>


<?php

$email_address = "contact@email.com";
//change to the proper email address

/*
All these other feilds values $user_name, $email_message, $email_subject, $email_address
are retrived from email_form.htm that we have created earlier!
*/

$message = "Contact form \n\nName: ". $user_name ."\nEmail: ". $email_from ."\n\nMessage: ". $email_message;
mail($email_address, "Msg From: " . $user_name ." Comments/Suggestions", $message, "From: ". $email_address);

echo "Thanks <B>". $user_name . "</B>. We have recieved your message and will contact you soon.";
?>