What are common reasons for the error "could not determine the SMTP to connect" when using PHP scripts for email sending?

The error "could not determine the SMTP to connect" typically occurs when the SMTP server information is not correctly configured in the PHP script. To solve this issue, ensure that the correct SMTP server address, port, username, and password are provided in the script. 

// Set SMTP server settings
$mail->IsSMTP();
$mail->Host = 'smtp.example.com'; // Specify main and backup SMTP servers
$mail->Port = 587; // Specify the SMTP port
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Username = 'your_smtp_username'; // SMTP username
$mail->Password = 'your_smtp_password'; // SMTP password
$mail->SMTPSecure = 'tls'; // Enable TLS encryption, `ssl` also accepted

Keywords

SMTP PHP scripts email sending error determination

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