Aggiornare PureMessage versione UNIX

1. As the PureMessage user ('pmx' by default), run 'pmx-service stop smtp' and 'pmx stop'.

2. As the root user, run '/opt/pmx/bin/pmx-setup'.
Using the menus, select 'Upgrade PureMessage Components', 'Check for updates', then 'Upgrade components'.

3. As the PureMessage user, run 'pmx start' and 'pmx-service start smtp'.