So it sounds like your aliases are not setup correctly for the RT
queue. I would verify that email to the queue is going to the queue.
BTW you error referance is with postfix. The errors coming from RT
are in either the HTML server logs or the system logs. Email comes
in the gets
My setup is near what you want to achieve, but i used procmail/RT CLI instead
of CommandBymail.
With ExchangeServer (mine is Office365) I configured postfix to send all the
outgoing mails with From field same as the user who logs on exchange.
Since apache user send mail the exchange server
