WordPress Email Notification Plugin

I’m having trouble with the email notification plugin. I get this error and I’m not sure how to fix it. Any ideas? Here’s my site: https://www.cheeseballonline.com

Notice: Undefined index: action in C:\Sites\Single22\chomratana\webroot\maillist\index.php on line 18

Notice: Undefined index: id in C:\Sites\Single22\chomratana\webroot\maillist\index.php on line 19

Notice: Undefined index: addr in C:\Sites\Single22\chomratana\webroot\maillist\index.php on line 20

Warning: mail(): “sendmail_from” not set in php.ini or custom “From:” header missing in C:\Sites\Single22\chomratana\webroot\maillist\index.php on line 217
Thanks for subscribing.
You will receive an email shortly to confirm your subscription.
Once you confirm your subscription you will begin to receive
notifications whenever cheeseballonline.com is updated.

Notice: Undefined variable: HTTP_HOST in C:\Sites\Single22\chomratana\webroot\maillist\install.php on line 108
/>Go Back