Symbols in email headlines for pear mail <p>I'm trying to put a heart symbol ♥ into the headline of an email which should be sent via the php pear mail package.</p> <p>But the receiver gets a ? instead of the heart so there has to be some mistake. It works if I manually send the email with my mail client.</p> <p>My code is the following:</p> <pre><code>require_once "Mail.php"; $smtp = Mail::factory('smtp', array ('host' =&gt; 'host', 'port' =&gt; port, 'auth' =&gt; true, 'username' =&gt; 'username', 'password' =&gt; 'password'); $headers = array ('From' =&gt; 'sender', 'Subject' =&gt; '♥ test', 'Charset' =&gt; 'utf-8', ); $mail = $smtp-&gt;send($to, $headers, 'heart test'); </code></pre> <p>What do I need to change in order to make the heart display correctly for the receiver of the email?</p>