Please contact the author of the Cobalt template for assistance
Please edit the file core/classes/Email.php in a text editor. Delete all code inside, and replace with this new code: https://gist.githubusercontent.com/samerton/a26df55561f9735eb2f69af6868f57fb/raw/39600339f889e35546daa8a7f9b89788cfa73261/Email.php
Then send a test email in the StaffCP -> Configuration -> Emails tab, and a full debug log will appear on screen with more information.
Please see the "Broken API" section of this issue: https://github.com/NamelessMC/Nameless/issues/2446
Thank you for providing this translation @0spy !
Would we have your permission to include the translation in the next version of Nameless (the license the files are released under is MIT)