hi. just to let you know, i fixed it.
If you have tried to upgrade amavis to newer version which is now amavis-new it breaks amavis.
at the time of apt-get install amavis, the install takes /etc/amavis/amavis.conf or /etc/amavis.conf and renames it to amavis.conf.disabled
the install then fails asking you to read more about the changes.
simply rename the amavis.conf.disabled to amavis.conf.WHATEVER and remove the amavis.conf.disabled file.
then run the apt-get install amavis again, and it will complete the install fine.
start amavis if needed,
hope this helps you