[tiwil]

I guess it doesn't require you to have smtp port 25 for achieving this you can simply use php's mail function instead of messing around with ports and firewall.

I do, at first I use PHP mailer, I already tried it from local, but when I tried from my website, it doesn't work.

I think the port 25 should be open for sending mail with php, because inside php.ini, it's using SMTP server to sent with localhost and port 25.

I will check my local php.ini, it should be same.