即使未启用加密，PHPMailer 也会使用 TLS 发送

Question

I am trying sending email using PHPMailer without TLS, but PHPMailer still tries to send email with TLS even if I do not enable it:

include_once("PHPMailer-master\PHPMailerAutoload.php");

$To = 'some@site.com';
$Subject = 'Topic';
$Message = 'msg test';

$Host = 'site.com.br';
$Username = 'contact@site.com.br';
$Password = 'pass';
$Port = "587";

$mail = new PHPMailer();
$body = $Message;
$mail->IsSMTP(); // telling the class to use SMTP
$mail->Host = $Host; // SMTP server
$mail->SMTPDebug = 1; // enables SMTP debug information (for testing)
// 1 = errors and messages
// 2 = messages only
$mail->SMTPAuth = true; // enable SMTP authentication
//$mail->SMTPSecure = 'ssl'; //or tsl -> switched off
$mail->Port = $Port; // set the SMTP port for the service server
$mail->Username = $Username; // account username
$mail->Password = $Password; // account password

$mail->SetFrom($Username);
$mail->Subject = $Subject;
$mail->MsgHTML($Message);
$mail->AddAddress($To);

if(!$mail->Send()) {
    $mensagemRetorno = 'Error: '. print($mail->ErrorInfo);
    echo $mensagemRetorno;
} else {
    $mensagemRetorno = 'E-mail sent!';
    echo $mensagemRetorno;
}

After send email, I got this message:

2016-09-01 21:08:55 CLIENT -> SERVER: EHLO www.johnmendes.com.br
2016-09-01 21:08:55 CLIENT -> SERVER: STARTTLS
2016-09-01 21:08:55 SMTP ERROR: STARTTLS command failed: 454 TLS not available due to temporary reason
2016-09-01 21:08:55 SMTP Error: Could not connect to SMTP host.
2016-09-01 21:08:55 CLIENT -> SERVER: QUIT
2016-09-01 21:08:55 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Erro ao enviar e-mail: 1

The server doesn't support ssl or tls.

Any idea?

Answer 1

This is covered in the PHPMailer docs. PHPMailer does opportunistic TLS - if the server advertises that it can do TLS (which yours does), it will use it automatically without you asking. You can disable this:

$mail->SMTPSecure = false;
$mail->SMTPAutoTLS = false;

From the error message, it looks like this is a temporary problem on your hosting provider. You would see more info if you set $mail->SMTPDebug = 2; .

I can see you've based your code on an obsolete example, so make sure you have the latest version of PHPMailer and base your code on the examples supplied with it.

Answer 2

I had the same problem using one.com: SMTP 465 wasn't working.

I could using port 25 with this configuration in phpmailer:

$mail->Host = 'send.one.com';
$mail->SMTPAuth = true;
$mail->Username = "***";
$mail->Password = "******";
$mail->From = "***";
$mail->SMTPAutoTLS = false;
$mail->SMTPSecure = 'none';
$mail->Port = 25;