Error messages on email signup page

I am now getting the following error messages at the top of my email signup page. I’m sure I have an error in the configuration but I’m having a hard time fixing it.

Notice: Constant MAILQUEUE_BATCH_SIZE already defined in /home/artwac5/public_html/songside.com/emaillist/config/config.php on line 331

Notice: Constant MAILQUEUE_BATCH_PERIOD already defined in /home/artwac5/public_html/songside.com/emaillist/config/config.php on line 343

The email registration still works though. Any help would be appreciated.

This is the link to the subscribe page: http://www.songside.com/emaillist/?p=subscribe&id=1

Thanks much,
Art