The basis for the mail function is as follows:
mail(string recipient, string subject, string body, string additional_headers)
Keep in mind that each extra header must be separated by a single newline character.
Now for your instance, you might want to try;
NOTE: I have also added a little bit at the start to test if the post was successful which you dont need... but it let u know if it was sent alright.
<?php
if(($to == ""))
{
print("There was an error sending mail to <b>$to</b>")
}
else
{
$to="fish40hk@hotmail.com";
$additional = "My Email is $email. Greeting from $name\n";
if($submit)
{
mail("$to","$sub","$mas","$additional");
}
}
?>
Let me know how that goes