thanks for the fast reply phoenix
yes..as i mentioned in the first post..it worked perfect for about a month..the server is even on production now

..and then i got complains from users that they didn't receive their emails and when i search the issue i 've found this problem in the logs..i think it started after zimbra updated ( maybe on antivirus database update) .. you can see this details in my first 2 posts from this thread..
sorry about the screen shot..i didn't know . maybe i can send you the screenshot on email if you thinks this would help. or any other extra info you would need...i just need help asap ..

thanks
p.s. i'm on zimbra 4.5.3_GA , open Suse 10_2