how to use sendmail as a client

[Lito Lampitoc]

Hi,

How do I setup sendmail on one of my box to send e-mail to my admin 
account in my mail server?
I'm using Postfix as my mail server (box 1) where my account is located, 
but I want my other box  (box 2 with sendmail) to send reports, such as 
logwatch, intrusion, etc.  to my admin accout.

Any ideas?

Thanks