Mail Problems (urgent please)

[coper]

Hello,
A few days ago I had a problem with mails. The problem was that the mails doesn't arrive. A member of this forum help me and told me to look the cpu usage for amavis service. Amavis was taking 100% of the cpu.
He told me this:
Search and find the problem by coming by using the debian repository and a few machines had this problem
Switched to volatile, and reinstall from there all the problems disappeared

That solved the problem of cpu usage. But now I'm having a strange problem. Still a lot of mails not arriving. I looked at the logs and I could not find anything strange.
/var/log/mail.err is empty
/var/log/mail.log have no errors, just a few warnings because some addresses do not exist.

Please I need some help, I'm having a lot of clients calling me because they are having problems receiving mails.

Reinstall amavis, reinstall postfix, courier, etc.
I don't know what to do.

Thanks a lot for your help again.

Regards,

c.