Phpmailer reported an error: SMTP error: failed to connect to server: (0)

One 、 explain

• According to this article PHPMailer Use , Configured with $mail->Username,$mail->Password after , The execution error is as follows ：

2021-09-01 12:22:37 SMTP ERROR: Failed to connect to server: (0)
SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting
Error

Two 、 solve

1、 Ignore ssl authentication （ My is for this reason ）

• stay $mail = new PHPMailer(); Add the following code after

//  Instantiation PHPMailer Core class 
$mail = new PHPMailer(); 

$mail->SMTPOptions = array(
    'ssl' => array(
        'verify_peer' => false,
        'verify_peer_name' => false,
        'allow_self_signed' => true
    )
);

...

2、 Set the port to bit 25 , Don't use SSL,465（ Other possible reasons ）

• hold

//  Set to use ssl Encrypted login authentication 
$mail->SMTPSecure = 'ssl';
//  Set up ssl Connect smtp The remote server port number of the server 
$mail->Port = 465;

• Change it to

$mail->Port = 25;

3、 ... and 、 His shan zhishi

• linux Next phpmailer Send email appears SMTP ERROR: Failed to connect to server: (0) error
• SMTP ERROR: Failed to connect to server: (0) resolvent
• ”SMTP connect() failed“ Reasons and solutions