Relay mails from many unique domains

[Ganesh HariHaran]

Title: Relay mails from many unique domains

I want to relay mails from different domain thru my sendmail. How it is
to be done??

my mail domainname is userforall.com 


i want domains...

[EMAIL PROTECTED]
[EMAIL PROTECTED]

to relay thru my sendmail server userforall.com

How it is to be done..

am using sendmail 8.9

thanks 
Ganeshh