Difficulty with PHP 8.1 and PHPMailer when sending emails using SMTP with authentication failure
I'm working on a personal project and I'm stuck on something that should probably be simple... I'm working with an scenario while trying to send emails using PHPMailer with SMTP in PHP 8.1. I have configured PHPMailer to use SMTP authentication, but I keep working with an behavior message: `SMTP behavior: Could not authenticate.` I've set up the mail server details correctly, but despite troubleshooting, the scenario continues. Here's the code snippet I am using: ```php use PHPMailer\PHPMailer\PHPMailer; use PHPMailer\PHPMailer\Exception; require 'vendor/autoload.php'; $mail = new PHPMailer(true); try { $mail->isSMTP(); $mail->Host = 'smtp.example.com'; // Specify main and backup SMTP servers $mail->SMTPAuth = true; // Enable SMTP authentication $mail->Username = 'your_email@example.com'; // SMTP username $mail->Password = 'your_password'; // SMTP password $mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS; // Enable TLS encryption, `ssl` also accepted $mail->Port = 587; // TCP port to connect to //Recipients $mail->setFrom('from@example.com', 'Mailer'); $mail->addAddress('recipient@example.com', 'Joe User'); $mail->isHTML(true); // Set email format to HTML $mail->Subject = 'Here is the subject'; $mail->Body = 'This is the HTML message body <b>in bold!</b>'; $mail->send(); echo 'Message has been sent'; } catch (Exception $e) { echo "Message could not be sent. Mailer behavior: {$mail->ErrorInfo}"; } ``` I've double-checked my SMTP server settings, username, and password. I've also tried using both `tls` and `ssl` for the `SMTPSecure` option and different ports (587 and 465), but nothing seems to work. Additionally, my firewall settings allow outgoing connections on these ports. Could anyone provide insights on what could be causing this authentication failure? Are there specific configurations or common pitfalls I might be missing here? Is there a better approach? Is there a better approach? I've been using Php for about a year now. Any examples would be super helpful.