PHP mailbox sending failed

Use PHPMailer and SMTP to send emails. If an error occurs, you can troubleshoot from the following aspects.

1. Check the phpinfo() page to confirm that the sockets extension is enabled.

2. Confirm openssl is enabled.

3. Confirm allow_url_fopen is enabled.

4. Add custom logs to the code to facilitate troubleshooting when errors occur.

5. Check whether ports 25 and 465 (SMTPS) are occupied.

If you are using port 465, you can modify:

$mail->Port = 465;

to:

$mail->SMTPSecure = 'ssl';
$mail->Port = 465;

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