What are common reasons for PHPMailer errors like "The following From address failed" and "SMTP server error: Bad sequence of commands"?

Common reasons for PHPMailer errors like "The following From address failed" and "SMTP server error: Bad sequence of commands" can include incorrect email address formatting, authentication issues with the SMTP server, or misconfigured SMTP settings. To solve these errors, double-check the email address format, ensure that the SMTP server credentials are correct, and verify that the SMTP settings match the server requirements. 

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;

require 'vendor/autoload.php';

$mail = new PHPMailer(true);

try {
    $mail->isSMTP();
    $mail->Host = 'smtp.example.com';
    $mail->SMTPAuth = true;
    $mail->Username = 'your_smtp_username';
    $mail->Password = 'your_smtp_password';
    $mail->SMTPSecure = 'tls';
    $mail->Port = 587;

    $mail->setFrom('from@example.com', 'Your Name');
    $mail->addAddress('recipient@example.com', 'Recipient Name');

    $mail->isHTML(true);
    $mail->Subject = 'Subject';
    $mail->Body = 'Email body content';

    $mail->send();
    echo 'Email sent successfully';
} catch (Exception $e) {
    echo 'Email could not be sent. Error: ' . $mail->ErrorInfo;
}

Keywords

PHPMailer From address SMTP server error Bad sequence of commands Email sending

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