RT - Redirecting Comments Directly to a Ticket with Postfix

We would like to be able to redirect a message directly from our inbox to an RT ticket, in the form ticketnumber@rthost and have it recorded on the specified ticket as a comment.

Assumptions:
1. MTA is postfix. Configuration is in /etc/postfix , rt-mailgate is in /usr/bin' .
2. RT is running on a virtual host, e.g. https://helpdesk.example.com/ .
3. RT's virtual host hostname is pointed to the postfix server with proper A/MX records.

Steps:

1. create or edit the file: /etc/postfix/canonical.pcre with contents:

/^(\d+)@helpdesk.example.com/i         ticket+${1}@helpdesk.example.com

2. ensure the file /etc/postfix/main.cf contains:

 recipient_delimiter = +
 canonical_maps = pcre:/etc/postfix/canonical.pcre

3. add to your /etc/aliases file:

 ticket:                       "|/usr/sbin/rt-mailgate --extension ticket --action comment --url https://helpdesk.example.com/"

4. Now just take care of the required postfix maintenance commands:

 # postmap /etc/postfix/canonical.pcre
 # newaliases
 # postfix reload

From here, you can simply redirect correspondence that should have gone on a ticket by redirecting the message to e.g. 1234@helpdesk .