[CentOS] Dealing with backscatter

Hi all,

I've had to deal with a sudden surge of backscatter email lately.

Would anyone be able to suggest to solutions that worked for them
regarding this problem?

We are using Scalix 11 as our email platform. It uses Sendmail MTA for
those who may not be familiar.

Thanks,
Matt

-- 
Stand before it and there is no beginning.
Follow it and there is no end.
Stay with the ancient Tao,
Move with the present.