Leanr PHP--mail()

Today I set up a PHP programming platform in my laptop.

But when I want to use mail() function to send mail using php, it does not work.

But when I upload the php file to uts server. It works. I search this on internet,

And I found the reason. Even though I already set up the apache http server. But I

still need to set up a mail server into my laptop. In this case, I install imail.

Then it works.