[exim] no logging for given Transport

Dear list,

I didn't find a simple way to stop exim from logging some routers
(like amavis, spamassassin).
As the system is running I don't need all the logfiles.

hosts_connection_nolog = 127.0.0.1 : etc
is too much as I want to see _some_ local proccess mails.

can anyone give me a short hint? Please.

Yours
Dirk