6.2.3 Transport for Exim 3

Add this to the transports section of your Exim config file, i.e. somewhere between the first and second ``end'' line:

  mailman_transport:
    driver = pipe
    command = MAILMAN_WRAP \
              '${if def:local_part_suffix \
                    {${sg{$local_part_suffix}{-(\\w+)(\\+.*)?}{\$1}}} \
                    {post}}' \
              $local_part
    current_directory = MAILMAN_HOME
    home_directory = MAILMAN_HOME
    user = MAILMAN_USER
    group = MAILMAN_GROUP