Fetchmail-rt-mailgate integration "correspondence not recorded" "permission denied"

I’m using fetchmail to “fetch” email from my main mail server which is
external to the firewall. I have created a test user, named rt. I have
also created a fetchmailrc file in its directory. I have added the aliases
to the aliases file as well. When I create a ticket, I have it set up to
email me, but when I respond, I get a returned email with a subject line
"correspondence not recorded", and the body “permission denied”. Does
anyone have any suggestion to what might be wrong with my configuration
thus far. Thank YOu

Manfred Elezovski