This extension for RT 3.2 and 3.4 allows sites to "Brand" individual queues with distinct tokens in the Subject: headers of outgoing email messages.

To enable this extension:

# cd into the unpacked distribution directory

perl Makefile.PL
make
make install

# edit your RT_SiteConfig.pm library to add the following line # immediately before the last line of the file:

use RT::Extension::BrandedQueues;

# The only thing after that use ..." line should be the line:

1;

You'll also need to modify any of your local email templates which use the $rtname variable. To edit your templates, log into RT as your administrative user, then click:

Configuration -> Global -> Templates -> <Some template name>

For example, RT's default "Autoreply" includes this line:

"There is no need to reply to this message right now. Your ticket has been assigned an ID of [{$rtname} #{$Ticket->id()}]."

Change this line to read:

"There is no need to reply to this message right now. Your ticket has been assigned an ID of [{$Ticket->QueueObj->Tag} #{$Ticket->id()}]."