Hi, Many thanks Theo Van Dinter, Gary V and others who helped. As suggested by Theo Van Dinter, I change the home directory of clamav user as /var/amavisd and then executed "/usr/local/bin/sa-learn -D --sync" it took around 6 hours but now "bayes_journal" has been reduced from 3.5 GB 42 KB. How I can prevent this problem from reoccuring?
___________________ Mohammad Junaid