We are on Joomla 4.2.1 and AcyMailing 7.9.4. When a user creates or reacts to a forum post (Kunena 6.0.0) and hits the send button this error comes up: Error 500: Could not instantiate mail function.
Aka a confirmation mail can not be sent for some reason. We have all our AcyMailing overides activated in the settings.
What can be the reason for not sending the confirmation email? All our other email functionality (registration, newsletters etc) is working fine.