[Exim] Help me about receiving mail

Hello my friends.
I currently have installed exim.3.3 on my system, my OS is linux redhat
7.3. I have set anythings for exim, and I can send mail to local users and
remote users, but I cann't see my new message that I get, these message
keep in /var/spool/mail/input directory that end of any file name is H for
header of message and D for body of message, and my exim program cann't
join this 2 part together and I cann't see my new message, then how I can
set it correctly.
Thanks advanced.
Soheila