[exim] How to remove rejected email

Hi,

I m wondering how to remove all rejected from Exim?

The error log shown the rejected email as follow:
2004-12-12 11:00:00 H=localhost.myserv.com (at.authtec.com) [127.0.0.1]
F=<root@???> temporarily rejected RCPT <root@???>:
Could not complete sender verify

Thanks
Sam