Recursive expressions in parameter values in main.cf

[Daniel Kauffman]

Some part of postfix (possibly postmulti, I'm not sure) does not appear 
to be evaluating recursive expressions in parameter values in main.cf

Here are the symptoms I am experiencing:
When creating a new postfix instance using:

  postmulti -I postfix-instance -e create

The following is added to /etc/postfix/main.cf

  multi_instance_wrapper = ${command_directory}/postmulti -p --

Then, when starting postfix using:

  /etc/init.d/postfix start

I get the following error:

  * Starting Postfix Mail Transport Agent postfix
    postfix: fatal: /postmulti: No such file or directory

When I edit /etc/postfix/main.cf as follows:

  multi_instance_wrapper = /usr/sbin/postmulti -p --

Then I am able to start postfix using:

  /etc/init.d/postfix start


A possibly related issue is that when configuring an instance of postfix 
by editing /etc/postfix-instance/main.cf as follows:

  multi_instance_name = postfix-$myhostname
  myhostname = mx.example.com

And then running:

  postmulti -l

I see a list of instances, but the instance name shows the literal 
expression "postfix-$myhostname" and not the result of evaluating the 
expression, in this case, "postfix-mx.example.com".


Any suggestions for further troubleshooting, or is this a bug?

I am working with Postfix version 2.6.5 on Ubuntu Server version 9.10 
beta with kernel version 2.6.30.


Thanks!

Daniel Kauffman