SMTP doesn't send mail to gmail and yahoo but has no error

Question

I'm trying to use google SMTP. It works fine with sending mail to my domain mail address but I don't receive any mail on gmail or yahoo. I've checked ssl, ports, ... also there is no error as $mail -> send() returns true. I checked other questions but I couldn't find anything useful to my problem.

Here is my code:

require_once("./PHPMailer-5.2.16/class.phpmailer.php");
           $mail = new PHPMailer();
           $mail->IsSMTP();
           $mail->SMTPSecure = 'ssl';
           $mail->SMTPDebug = 1;
           $mail->SMTPAuth = true;
           $mail->Host = "smtp.gmail.com";
           $mail->Port = 465;
           $mail->Username = "e.g@gmail.com";
           $mail->Password = "password";
           $mail->SetFrom("e.g@gmail.ir");
           $mail->Subject = "This is just a test";
           $mail->Body = "Just a test";
           $mail->AddAddress($email);// or $mail->AddAddress("e.g@gmail.com)
           if (!$mail->Send()) {
                echo "Mailer Error." . $mail->ErrorInfo;
           }

I've also tried:

tls

ports 587 and 485

$mail->Host = "ssl://smtp.googlemail.com";

$mail->Host = "ssl://smtp.gmail.com";

but none of them worked.

-And I just figured out

"Only when I delete the line $mail->IsSMTP(); my domain mail can receive mail!"

Update: I also tried $mail->SMTPDebug = 2; but couldn't find any log/message print out.