email validation

i have a problem with email validation in codeigniter 2.2.4 and am using wamp, the error is
Severity: Warning

Message: mail(): Failed to connect to mailserver at "localhost" port 25, verify your "SMTP" and "smtp_port" setting in php.ini or use ini_set()

Filename: libraries/Email.php

Line Number: 1554

please i need some help

<?sid?>