[exim] exim problem

I have one more problem.i had created two user gourav    &   hemant  on my
Centos 5.4 exim server machine.  when i m configure outlook express with
exim to use gourav user.  Its doesn,t work the problem is this :- when i m
sending a mail on my gmail ID , its getting some error pls check error in
attachement.but gourav able to send a mail to hemant means locally mail send
successfully. And when i m sending a mail from server to gmail its going. So
pls help thnx in advance i m very thankful to u.