I've been using .courier extensions for some time and have a certain one that is getting spammed regularly that I'd like to reject mail to. I currently have a .courier-default file for my account as well as a few other .courier-whatever files with specific instructions. But what I'm not sure is how I can reject mail to one given extension without getting rid of .courier-default. I know I could create a .courier-badextension with delivery instructions to /dev/null or such but I'd like to reject the mail outright with a 5xx error right after the RCPT TO: is sent instead of accepting the mail into the queue. Is this possible with .courier instructions or should I be doing this in a rcptfilter?

Jay