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$mailer->SMTPAuth = true;
However, I imagine future updates may revert this code, and I was thinking it would be useful if "anonymous authentication" could be a toggle in the Email settings in the UI. It would then be a variable in the email_functions.inc.php file and wouldn't get overwritten when upgrading. I'm not sure if this is the place to submit suggestions like this, but I couldn't really find anywhere else.