ENVOYER UN MAIL VIA UN SERVEUR SMTP RELAIS

// definition du serveur de mail
define("SERVEURMAIL","197.234.22.485");
ou
define("SERVEURMAIL","mailhost.monDomaine.fr");


//fonction email

function email($from, $to, $subject, $msg,$content="text/plain"){
 $headers = "MIME-Version: 1.0\r\n";
 $headers .= "Content-type: ".$content;
 $headers .= ";charset=iso-8859-1\r\n";
 $headers .= "Reply-To: $from\r\n";
 $headers .= "X-Mailer: PHP SCRIPT";
       
		if ($from!=null && $to!=null && $subject!=null && $msg!=null)
			//&& checkmail($from)&&checkmail($to)
        { 
        $connection = fsockopen (SERVEURMAIL,25, &$errno, 
&$errstr, 1);
                if (!$connection) {
                 return false;
                } else {
                 $res1=fgets($connection, 256);
                 if(substr($res1, 0, 3) != "220") return false;
 
                 fputs($connection, "HELO localhost\n");
                 $res2=fgets($connection, 256);
                 if(substr($res2, 0, 3) != "250") return false;
 
                 fputs($connection, "MAIL FROM: $from\n");
                 $res3=fgets($connection, 256);
                 if(substr($res3, 0, 3) != "250") return false;
 
                 fputs($connection, "RCPT TO: $to\n");
                 $res4=fgets($connection, 256);
                 if(substr($res4, 0, 3) != "250") return false;
 
                 fputs($connection, "DATA\n");
                 $res5=fgets($connection, 256);
                 if(substr($res5, 0, 3) != "354") return false;
 
                 fputs($connection, "TO:$to\nFrom:$from\nSubject:$subject\n$headers\n\n$msg\n.\n");
                 $res6=fgets($connection, 256);
                 if(substr($res6, 0, 3) != "250") return false;
 
                 fputs($connection, "QUIT\n");
                 $res7=fgets($connection, 256);
                 if(substr($res7, 0, 3) != "221") return false;
 
                 fclose ($connection);}
                 if(substr($res1, 0, 3) == "220" && substr($res2, 0, 3) 
== "250" && substr($res3,0, 3) == "250" && substr($res4, 0, 3) == "250" 
&& substr($res5,
 0, 3) == "354" && substr($res6, 0, 3) == "250" && substr($res7, 0, 3) 
== "221") return true;
    }else{
        return false;
        }
}