[Mailman-Users] Help me Please!!!

[Euler Ricardo Rodrigues Ribeiro]

Hello. I want the problem that don´t find solution
Help me please!!!!

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  ----- The following addresses had permanent fatal errors -----
"|/usr/local/mailman/mail/mailman post gerleca"
    (reason: 2)
    (expanded from: <gerleca at jau.mma.gov.br>)

   ----- Transcript of session follows -----
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 "mailnull".  Try tweaking the mail server to run the
script as group "mailman", or re-run configure, 
providing the command line option `--with-mail-gid=mailnull'.
554 5.3.0 unknown mailer error 2