6/28    Help. My ISP doesn't forward my email anymore, or at least it is
        forwarding but has a huge delay. Below is a sample from
        "sendmail -bp". My user name is joe and my school is http://school.edu.
        What could be going on? Thanks:
        519FF8D747     3812 Wed Jun 27 13:00:37  joe@hello.dreamhost.com
        (host <DEAD>smarty.dreamhost.com<DEAD>[66.33.216.24] said: 450 Server
        configuration problem (in reply to RCPT TO command))
                                         joe@cs.school.edu
        \_ Maybe your school implemented greylisting and your ISP doesn't
           deal with 450s correctly?  -John
        \_ Talk to your ISP.  I think it's a "450 Server configuration problem"