In case this is useful to anyone else:

=== What I was going to post ===
After updating postfix to 2.10, mailman (which has datestamps on the binaries 
of Apr 2010) is failing. The log message in maillot is the dreaded:

Aug  3 10:38:33 mail 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

Since Mailman hasn't changed and has worked through 2.6 and 2.8, I suspect 
there is some configuration that has changed in postfix. Is this something I 
can fix in recompiling postfix (best), or do I have to recompile mailman (don't 
want to)?
=== EOF ===

I found the solution before posting. I went into the data directory for mailman 
and changed the owner on the aliases and aliases.db to "mailman" and everything 
works fine. I could also have simply run 

bin/check_perms -f

(most of the info I found on the error was about recompiling mailman to fix 
this error, which is why I'm sending this along). This is almost certainly the 
solution to the problem I had in Jan 2010 in mailman-user, for anyone playing 
along at home.)

-- 
"640K ought to be enough RAM for anybody." - Bill Gates, 1981

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