PHPMailer plugin in Organizr is not working

Even if you disabled TLS in the Organizr configuration page, if your mail server advertises that it supports TLS PHPMailer will try to use it, which will fail.

In order to resolve this edit file api/plugins/php-mailer.php and add after line 127 following:

$mail->SMTPAutoTLS = false;

Now sending emails should work without TLS usage.