One problem is that Amavisd is not started, this is caused by wrong amavis directory permissions. Thes efiles are not managed by ispconfig, so the reason for the problem must be something outside of ispconfig, e.g. a failed system update or someone accidently set wrong permissions on several Linux system directories.
What you cany try is to reinstall amavis:
apt-get install --reinstall amavisd-new
if this wont help, try to run:
Seems as if files or debian packages have been deleted as postfix mysql package is missing. Install it with:
apt-get install --reinstall postfix-mysql