Hello, I have the following error: Whenever I try to add a new agent, it returns me the following message "Unable to add this agent. Fix all the errors below and try again." Even though all options are correct and verified, it still won't let me set up the agent. In system logs, it returns this error: Mailer Error Unable to email via php mail function
(Note: everything worked correctly yesterday!)
System Information:
PHP 7.4.3
osTicket 1.15.4
Ubuntu Server
