Mailman Error Ubuntu 12.04

[Jeff_Carpenter]

I followed the instructions at https://help.ubuntu.com/community/Mailman (Ubuntu 12.04, mailman 2.14, Exim 4.76) but I'm getting the following message when trying to subscribe to a test list, "Group mismatch error. Mailman expected the mail wrapper script to be executed as group "daemon", but the system's mail server executed the mail script as group "Debian-exim". Try tweaking the mail server to run the script as group "daemon", or re-run configure, providing the command line option `--with-mail-gid=Debian-exim'."

Any suggestions how I should proceed to fix without having to rebuild mailman from source?

Thanks!

<JeffC.>