Hello Igor,
Yes, I know, sounds crazy and in some way, stupid. But I'm using the Roundcube webmail and I need to install the vacation plugin there. This plugin needs some tables from postfixadmin but I'm afraid to install it and corrupt the system.
I know that Plesk have a vacation option but my clients love to make everything inside the Roundcube, including change password (that I solve with another plugin), spam control, etc. I'm just loosing this feature.
Thank you!