Mailman - group mismatch error

[David Southwell]

Thanks in advance for any replies.

Despite scouring the web and trying the many different solutions that seem to 
be offered to this problem I have be unable to fix it. Is there a way of 
tracing the cause?

The entry in maillog does not say how to tweak postfix!

Freebsd 7.2 p3 amd64 on Intel quad core

I have run 
/usr/local/mailman
dns1# ./bin/check_perms
No problems found
dns1# ./bin/genaliases
dns1# ls -l /etc |grep aliases
-rw-r--r--  1 root  wheel      5916 Dec 27 18:14 aliases
-rw-r--r--  1 root  wheel     16384 Dec 27 18:48 aliases.db
-rw-r--r--  1 root  wheel      2726 Dec 27 17:52 aliases~
dns1# ls -l ./data
total 58
-rw-r-----  1 mailman  mailman     41 Dec 19 17:46 adm.pw
-rw-rw----  1 mailman  mailman   3760 Dec 28 09:40 aliases
-rw-rw----  1 mailman  mailman  16384 Dec 28 09:40 aliases.db
-rw-r--r--  1 root     mailman     10 Dec 28 09:23 last_mailman_version
-rw-r--r--  1 root     mailman  14100 Dec 28 09:23 sitelist.cfg
-rw-rw----  1 root     mailman   3284 Dec 28 09:40 virtual-mailman
-rw-rw----  1 mailman  mailman  16384 Dec 28 09:40 virtual-mailman.db


I tried to get the mail script changed to run --with-mail-gid=nobody but 
either I did not issue the command correctly or if I did it made no 
difference.! If someone could post the comand line they know to be correct I 
will try that again.





Extract from maillog:
TEST_15
Dec 28 09:25:41 dns1 postfix/pickup[33009]: 1278934D451: uid=1001 
from=<david at vizion2000.net>
Dec 28 09:25:41 dns1 postfix/cleanup[44509]: 1278934D451: message-
id=<200912280925.41000.david at vizion2000.net>
Dec 28 09:25:41 dns1 postfix/qmgr[23289]: 1278934D451: 
from=<david at vizion2000.net>, size=3166, nrcpt=2 (queue active)
Dec 28 09:25:41 dns1 Mailman mail-wrapper: Group mismatch error.  Mailman 
expected the mail wrapper script to be executed as group "mailman", but the 
system's mail server executed the mail script as group "nobody".  Try tweaking 
the mail server to run the script as group "mailman", or re-run configure,  
providing the command line option `--with-mail-gid=nobody'.
Dec 28 09:25:41 dns1 postfix/local[44512]: 1278934D451: 
to=<david at vizion2000.net>, relay=local, delay=0.07, delays=0.06/0.01/0/0, 
dsn=2.0.0, status=sent (delivered to mailbox)
Dec 28 09:25:41 dns1 postfix/local[44511]: 1278934D451: 
to=<bps_comps_print_announce at vizion2000.net>, relay=local, delay=0.08, 
delays=0.06/0.01/0/0.01, dsn=5.3.0, status=bounced (Command died with status 
2: "/usr/local/mailman/mail/mailman post bps_comps_print_announce". Command 
output: Group mismatch error.  Mailman expected the mail wrapper script to be 
executed as group "mailman", but the system's mail server executed the mail 
script as group "nobody".  Try tweaking the mail server to run the script as 
group "mailman", or re-run configure,  providing the command line option `--
with-mail-gid=nobody'. )
Dec 28 09:25:41 dns1 postfix/cleanup[44509]: 18F7434D456: message-
id=<20091228092541.18F7434D456 at dns1.vizion2000.net>
Dec 28 09:25:41 dns1 postfix/bounce[44514]: 1278934D451: sender non-delivery 
notification: 18F7434D456
Dec 28 09:25:41 dns1 postfix/qmgr[23289]: 18F7434D456: from=<>, size=5719, 
nrcpt=1 (queue active)
Dec 28 09:25:41 dns1 postfix/qmgr[23289]: 1278934D451: removed
Dec 28 09:25:41 dns1 postfix/local[44512]: 18F7434D456: 
to=<david at vizion2000.net>, relay=local, delay=0, delays=0/0/0/0, dsn=2.0.0, 
status=sent (delivered to mailbox)
Dec 28 09:25:41 dns1 postfix/qmgr[23289]: 18F7434D456: removed

Thanks 

David