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 | Common Problems FAQProblem: All Mailman web pages give a 404 File not found error.Solution: Your web server has not been set up properly for handling Mailman's cgi commands. Make sure you've: 
 Problem: All Mailman web pages give an Internal
        Server Error.
     You need to reinstall Mailman, and specifyAttempt to exec script with invalid gid 51, expected 99 $CGI_GIDto be 51, as described in the
        installation instructions.Problem:  I send mail to the list, and get back mail saying the
        list is not found!
     Problem:  I send mail to the list, and get back mail saying,
          unknown mailer error.
     You need to reinstall Mailman, and specifyAttempt to exec script with invalid gid 51, expected 99 $MAIL_GIDto be 51, as described in the
        installation instructions. see notes on Postfix below, as by
        default it will create these problems on installation.Problem:  I use Postfix for my MTA and the mail wrapper programs
       are logging complaints about the wrong GID.
     Also as user mailman, run% postalias the-alias-file % python -c'import os; print os.getgid()' This should print out the group id that Mailman should be configured to expect when the mail wrapper programs are run. Call it thegid. Rebuild Mailman with % ./configure --with-mail-gid=thegid Problem:  I send mail to the list, and get back mail saying,
       sh: wrapper not available for sendmail programs
     Some common names for this directory are
         Note that on Debian Linux, the system makes
         Problem:  I messed up when I called configure.  How do I clean
        things up and re-install?
     % make clean % ./configure --with-the-right-options % make install |