Maybe you will have to set the details of your mail server on your local.config.php file. Open your local.config.php and find this:
Config::Set('EMAIL_USE_SMTP', false);
# Add multiple SMTP servers by separating them with ;
Config::Set('EMAIL_SMTP_SERVERS', '');
Config::Set('EMAIL_SMTP_PORT', '25');
Config::Set('EMAIL_SMTP_USE_AUTH', false);
Config::Set('EMAIL_SMTP_USER', '');
Config::Set('EMAIL_SMTP_PASS', '');
Configuring it might solve your problems.