send emails in php (no replies)

I am using the "mail()" function in php to send emails from a webpage running in WAMP on my laptop. This used to work but I now get a failure message "local host failed to connect to mailserver at outmail.f2s.com. Should now be mail.overssl.net". My email used to be handled by outmail.f2s.com port 25 but is now mail.overssl.net. The error suggest setting the correct parameters in php.ini or using ini_set. Anyone know how to do this.