1. there is no mail service unless you install and configure one.
2. see one.
If you need to 'send' mail - YOU have to either
A. Use the 'sendmail' that comes with XAMPP - it is in \xampp\sendmail along with a sendmail.ini file
B: install and configure a mailserver - such as Mercury of HMail (you will need a registered domain and access to your nameservers)
Then you will probably need to edit php.ini on the wild guess that whatever script it is you are using is written in PHP. You may also need to edit that script's configuration file.