Phpbb Mails To Yahoo.com Bouncing

Recently the notification emails that are sent from my phpBB forum when someone gets a new PM or a reply is posted to a thread they are watching are bouncing.<br /><br />It only seems to be happening to those with a yahoo.com email address.<br /><br />Below is part of the undeliverable mail message that is coming back to me with the person's email address x'd out. Any ideas how to fix this?<br /><br />---------------------------<br /><br />This message was created automatically by mail delivery software.<br /><br />A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed:<br /><br /> <!-- e --><a href="mailto:[email protected]">[email protected]</a><!-- e --><br /> unrouteable mail domain "yahoo.com"<br /><br />------ This is a copy of the message, including all the headers. ------<!--content-->
Open a ticket at the help desk, and we'll take a look for you.<!--content-->
 
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