When I receive this email it appears it was sent by the sites administrator instead of the email address in this field
<input name="from">What coould be the reasons to this?
{exp:email:contact_form replyto="yes" user_recipients="true"}
<input type="hidden" name="subject" value="Subject">
<input type="hidden" name="message" value="Check out {embed="inc/current_url"}!">
<input name="name" value="" />
<input name="from" value="" >
<input name="to" value="" />
{if captcha}
<input type="text" class="skjema" name="captcha" value="Captcha text" />
{captcha}
{/if}
<input type="submit" value="Send"/>
{/exp:email:contact_form}