Apache::Qpsmtpd3pm

  Listen 0.0.0.0:25 smtp
  AcceptFilter smtp none
  ## "smtp" and the AcceptFilter are required for Linux, FreeBSD 
  ## with apache >= 2.1.5, for others it doesn't hurt. See also
  ## http://httpd.apache.org/docs/2.2/mod/core.html#acceptfilter
  ## and http://httpd.apache.org/docs/2.2/mod/mpm_common.html#listen
  LoadModule perl_module modules/mod_perl.so
  <Perl>
  use lib qw( /path/to/qpsmtpd/lib );
  use Apache::Qpsmtpd;
  $ENV{QPSMTPD_CONFIG} = "/path/to/qpsmtpd/config";
  </Perl>
  <VirtualHost _default_:25>
  PerlModule Apache::Qpsmtpd
  PerlProcessConnectionHandler Apache::Qpsmtpd
  # can specify this in config/plugin_dirs if you wish:
  PerlSetVar qpsmtpd.plugin_dirs /path/to/qpsmtpd/plugins
  PerlSetVar qpsmtpd.loglevel 4
  </VirtualHost>

Using multiple instances of Qpsmtpd on the same server is also possible by setting:

  $ENV{QPSMTPD_CONFIG} = "USE-VIRTUAL-DOMAINS";

Then in the VirtualHost of each config define the configuration directory:

  PerlSetVar qpsmtpd.config_dir /path/to/qpsmtpd/config

Several different configurations can be running on the same server.