r...@ubuntu:~# ls -l /var/spool/MIMEDefang
total 8
-rw-r----- 1 defang defang 5 2010-12-12 12:30 mimedefang-multiplexor.pid
srw------- 1 defang defang 0 2010-12-12 12:30 mimedefang-multiplexor.sock
-rw-r----- 1 defang defang 5 2010-12-12 12:30 mimedefang.pid
srwxr-x--- 1 defang defang 0 2010-12-12 12:30 mimedefang.sock

so anyone outside of the 'defang' group has no access to the .sock file. (you forgot 'file mimedefang.sock' to show file type. but let's assume it's a real socket).
Sorry about forgetting the file mimedefang.sock. It is showing as a socket..
  /var/spool/MIMEDefang/mimedefang.sock: socket

Would putting the postfix user in the defang group get around the permissions problem? The error does not show a permissions problem, just that it cannot find the file. I'm guessing that has something to do with the chroot.

maybe you have a chroot issue?
# grep smtpd master.cf
I don't think there is a chroot issue... see below

I think there is... see below;-p

r...@ubuntu:/# grep smtpd /etc/postfix/master.cf
smtp inet n - - - - smtpd

if you check master.cf, you should see:
#==========================================================================
# service type  private unpriv  chroot  wakeup  maxproc command + args
#               (yes)   (yes)   (yes)   (never) (100)
# ==========================================================================

the 5th field is chroot and defaults to 'yes'. In your config, it is '-', so it defaults to chrooted.

Sorry for asking these simple questions, but what are my choices for dealing with the chroot issue?

Thanks again for all the help.

Phil

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