donors not receing thankyou emails

Hello,

My donors are not receiving the thank you emails, but they test emails do send. Somehow they show up as being sent from the login name I use for our host.

http://wishuponapaw.org/

Here is the log from my donation:
05-20-2013 02:58:20 Donation transaction started
05-20-2013 02:58:20 Name: Alex Nelson
05-20-2013 02:58:20 Amount: 1
05-20-2013 02:58:20 IPN: http://wishuponapaw.org/wp-content/plugins/seamless-donations/dgx-donate-paypalstd-ipn.php
05-20-2013 02:58:46 IPN processing start
05-20-2013 02:58:46 IPN VERIFIED for sessionID mp3pop7m2tc1p5a01ln42it8v0
05-20-2013 02:58:46 Payment status = Pending for sessionID mp3pop7m2tc1p5a01ln42it8v0

Thanks for any help you can provide.

http://wordpress.org/extend/plugins/seamless-donations/