Can't send test email from bare PHP to SMTP

[SonicSong]

I have an issue when trying to send test email from bare PHP on my local machine via SMTP

<?php
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
use PHPMailer\PHPMailer\SMTP;

require 'libs/PHPMailer-master/src/Exception.php';
require 'libs/PHPMailer-master/src/PHPMailer.php';
require 'libs/PHPMailer-master/src/SMTP.php';

$mail = new PHPMailer(true);

try {
//Server settings
    $mail->isSMTP();
    $mail->SMTPAuth = true;
    $mail->SMTPSecure = 'tls';
    $mail->Host = 'fedora.email';
    $mail->Port = 587;
    $mail->SMTPDebug = SMTP::DEBUG_SERVER;
    $mail->Username = '<username>';
    $mail->Password = "<password>";

    //Recipients
    $mail->setFrom('<email>', '<name>');
    $mail->addAddress('<email>', '<name>');     //Add a recipient

    //Content
    //$mail->isHTML(true);
    $mail->Subject = 'Here is the subject';
    $mail->Body    = 'This is the HTML message body <b>in bold!</b>';
    //$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

    //echo "Probably works?<br>";
    //var_dump($mail);

    return $mail->send();

/*} catch (phpmailerException $e) {
    echo $e->errorMessage(); //Pretty error messages from PHPMailer
} catch (Exception $e) {
    echo $e->getMessage(); //Boring error messages from anything else! */
//}catch (Exception $e) {
//    echo "Message could not be sent. Mailer Error: {$mail->ErrorInfo}";
//}
    echo "Email sent successfully!";
} catch (phpmailerException $e) {
    echo "PHPMailer Error: " . $e->errorMessage();
} catch (Exception $e) {
    echo "Error: " . $e->getMessage();
}

Error that I get is this:

PHP Fatal error:  Uncaught Error: Undefined constant "PHPMailer\PHPMailer\PHPMailer" in /Applications/XAMPP/xamppfiles/htdocs/form-php/libs/PHPMailer-master/src/PHPMailer.php:2021
Stack trace:
#0 /Applications/XAMPP/xamppfiles/htdocs/form-php/libs/PHPMailer-master/src/PHPMailer.php(1682): PHPMailer\PHPMailer\PHPMailer->smtpSend('Date: Sat, 14 O...', 'This is the HTM...')
#1 /Applications/XAMPP/xamppfiles/htdocs/form-php/libs/PHPMailer-master/src/PHPMailer.php(1516): PHPMailer\PHPMailer\PHPMailer->postSend()
#2 /Applications/XAMPP/xamppfiles/htdocs/form-php/form_mail.php(37): PHPMailer\PHPMailer\PHPMailer->send()
#3 {main}
  thrown in /Applications/XAMPP/xamppfiles/htdocs/form-php/libs/PHPMailer-master/src/PHPMailer.php on line 2021

Fatal error: Uncaught Error: Undefined constant "PHPMailer\PHPMailer\PHPMailer" in /Applications/XAMPP/xamppfiles/htdocs/form-php/libs/PHPMailer-master/src/PHPMailer.php:2021
Stack trace:
#0 /Applications/XAMPP/xamppfiles/htdocs/form-php/libs/PHPMailer-master/src/PHPMailer.php(1682): PHPMailer\PHPMailer\PHPMailer->smtpSend('Date: Sat, 14 O...', 'This is the HTM...')
#1 /Applications/XAMPP/xamppfiles/htdocs/form-php/libs/PHPMailer-master/src/PHPMailer.php(1516): PHPMailer\PHPMailer\PHPMailer->postSend()
#2 /Applications/XAMPP/xamppfiles/htdocs/form-php/form_mail.php(37): PHPMailer\PHPMailer\PHPMailer->send()
#3 {main}
  thrown in /Applications/XAMPP/xamppfiles/htdocs/form-php/libs/PHPMailer-master/src/PHPMailer.php on line 2021

I'm trying to run this via XAMPP and local PHP install that is on version 8.2.11.
In the end it is supposed to work on LAMP server.

[Synchro]

It's unclear where that is coming from. One thing though, you are catching an exception class called phpmailerException, but that doesn't exist.

[SonicSong]

After adding smtpConnect() and smtpClose I was able to use the appliaction key and it seemed like it worked but in the end I didn't received any email.

In terminal I've got this message

2023-10-14 16:36:27	SERVER -> CLIENT: 220 fedora.email ESMTP Welcome to feeder! [zone-mta/3.6.5]
2023-10-14 16:36:27	CLIENT -> SERVER: EHLO <device>
2023-10-14 16:36:27	SERVER -> CLIENT: 250-fedora.email Nice to meet you, <idk what is that but probably good to cut>
                   	                  250-PIPELINING
                   	                  250-8BITMIME
                   	                  250-SMTPUTF8
                   	                  250-AUTH LOGIN PLAIN
                   	                  250-STARTTLS
                   	                  250 SIZE 31457280
2023-10-14 16:36:27	CLIENT -> SERVER: STARTTLS
2023-10-14 16:36:27	SERVER -> CLIENT: 220 Ready to start TLS
2023-10-14 16:36:28	CLIENT -> SERVER: EHLO <device>
2023-10-14 16:36:28	SERVER -> CLIENT: 250-fedora.email Nice to meet you, <idk what is that but probably good to cut>
                   	                  250-PIPELINING
                   	                  250-8BITMIME
                   	                  250-SMTPUTF8
                   	                  250-AUTH LOGIN PLAIN
                   	                  250 SIZE 31457280
2023-10-14 16:36:28	CLIENT -> SERVER: AUTH LOGIN
2023-10-14 16:36:28	SERVER -> CLIENT: 334 <id?>
2023-10-14 16:36:28	CLIENT -> SERVER: [credentials hidden]
2023-10-14 16:36:29	SERVER -> CLIENT: 334 <id?>
2023-10-14 16:36:29	CLIENT -> SERVER: [credentials hidden]
2023-10-14 16:36:29	SERVER -> CLIENT: 235 Authentication successful
2023-10-14 16:36:29	CLIENT -> SERVER: QUIT
2023-10-14 16:36:29	SERVER -> CLIENT: 221 Bye
Email sent successfully!%                                                                                             

I have no idea how to move forward with this as it seems like it does connect to SMTP but in the end it doesn't send anything.

Closed by accident sorry

[SonicSong]

Okay. Figured out that on PHPMailer-6.8.0 it worked without any issue. No idea what's wrong with 6.8.1.

[Synchro]

I don't know what code that is, but it's not from PHPMailer. At a guess I'd say it's perhaps a child class that needs updating?

[SonicSong]

To be fair I got the library from this link that was in README.md in the manual installation section.

It can be that it was just outdated and it was fully my fault for not getting it from the Releases.

[Synchro]

The code in the current download of that file is the same. An obvious syntax error like that would never have been in a release version as even the most basic tests would have failed.