[Mailman-Users] Group mailnull

[John Poltorak]

I've just tried send mailing to a mailman list and get this error:-


   ----- Transcript of session follows -----
Group mismatch error.  Mailman expected the mail
wrapper script to be executed as group "mail", but
the system's mail server executed the mail script as
group "mailnull".  Try tweaking the mail server to run the
script as group "mail", or re-run configure,
providing the command line option `--with-mail-gid=mailnull'.
554 5.3.0 unknown mailer error 2



Why does the script get run as the group 'mailnull'? 

I'm not sure what I need to do to run it as group 'mail' - I thought it 
was already set to that. Can anyone help?


-- 
John