VMM: Post-2to3 fix. Use the re.ASCII flag for ASCII-only patterns.
The local-part of an email address and Postfix configuration parameters
may contain only ASCII characters.
============
Installation
============
.. toctree::
:maxdepth: 1
installation/prerequisites
installation/system_preparation
installation/postgresql_configuration
installation/dovecot_configuration
installation/postfix_configuration
installation/install_vmm