Subscriptions not being sent

Hello,

When someone signs up or a new blog posted the emails are not being sent out.

We have a contact form on the website and the emails are going through.

I am getting an error sent to the administrator email....

Here is the website and below is a copy of the email error.
http://www.dougpeacock.net

Thanks, Chuck

Return-Path: <cirestone@yahoo.com>
Received: (qmail 8364 invoked by uid 0); 7 May 2014 16:05:01 -0000
Received: from unknown (HELO cmgw3) (67.20.127.203)
by soproxy4.mail.unifiedlayer.com with SMTP; 7 May 2014 16:05:01 -0000
Received: from host295.hostmonster.com ([66.147.240.95])
by cmgw3 with
id z44y1n00Z24Brde01451PK; Wed, 07 May 2014 10:05:01 -0600
X-Authority-Analysis: v=2.1 cv=XPOjF2RE c=1 sm=1 tr=0
a=itwRhR3rBUS+Z7KggeyZgQ==:117 a=itwRhR3rBUS+Z7KggeyZgQ==:17 a=DsvgjBjRAAAA:8
a=f5113yIGAAAA:8 a=f8_S3n9t2uQA:10 a=VjI2kFv4X18A:10 a=oJL9TIRMo0YA:10
a=wPDyFdB5xvgA:10 a=IkcTkHD0fZMA:10 a=CjxXgO3LAAAA:8 a=zIltDNGJAAAA:8
a=Z9AxVYSVyIMA:10 a=SSmOFEACAAAA:8 a=Qo1ijPcVowwM4MhdCLYA:9
a=dXTfpOn4ilwTPz5y:21 a=QEXdDO2ut3YA:10 a=_W_S_7VecoQA:10 a=tXsnliwV7b4A:10
a=rkEf3Xv3eBcA:10 a=p403mkujtbAA:10
Received: from localhost ([127.0.0.1]:52522 helo=host295.hostmonster.com)
by host295.hostmonster.com with esmtp (Exim 4.82)
(envelope-from <cirestone@yahoo.com>)
id 1Wi4L4-0005Ju-1e
for cirestone@yahoo.com; Wed, 07 May 2014 10:04:58 -0600
To: cirestone@yahoo.com
Subject: New site subscription
X-PHP-Originating-Script: 2561:phpmailer.php
Date: Wed, 7 May 2014 10:04:55 -0600
From: Doug Peacock <cirestone@yahoo.com>
Reply-To: Doug Peacock <cirestone@yahoo.com>
Message-ID: <28c132b6738bbc660d604b44e958e5ee@http://www.dougpeacock.net>
X-Priority: 3
X-Mailer: PHPMailer 5.2.1 (http://code.google.com/a/apache-extras.org/p/phpmailer/)
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/html; charset="utf-8"
X-Identified-User: {:host295.hostmonster.com:dougpeac:dougpeacock.net} {sentby:program running on server}

(Body supressed)