I am not able to send mail by php using mail() function..
This is what I am using:
mail("info@herbsandcures.com","test","msg","From: info@herbsandcures.com")

I have Sendmail installed on my my server..
Though I am able to send mail using JavaMail API, and normal client tools like neomail etc..

There must be problem in php itself...
I have also edited my php.ini as :

; For Unix only. You may supply arguments as well (default: "sendmail -t -i").
SMTP = localhost ;
sendmail_path = /usr/sbin/sendmail -t -i;
;sendmail_from = root@localhost.com ;


Please help me..

I think you're using the function incorrectly.

PHP Code:

                /* sending to */
                $To = "me@mywebsite.com";

                /* subject */
    $Subject = "Birthday Reminders for August";

                /* content */
                $Content = "bla bla bla bla"
            
    /* To send HTML mail, you can set the Content-type header. Delete 
                     the forward slash's as appropriate, the first paragraph 
                     will send in plain text*/

                //$headers .= "Content-type: text/plain\n";
    //$headers .= "Content-Transfer-Encoding: quoted-printable\n";
    
    //$headers .= "Content-type: text/html; charset=iso-8859-1\n";
    //$headers .= "Content-transfer-encoding: 8bit\n";
        
    /* additional headers */
    $headers .= "From: $FromName <$FromAddress>\n";
    
    /* and now mail it */

    mail($To, $Subject, $Content, $headers);