exim.conf help, need to block email sent through server from 1 server ip

I have latest cpanel and exim, am looking to start a free hosting service but need help with 2 subjects.
Firstly I'd like to prevent any email sending from the reseller's ip that I'll be using. I was told its possible to do this in exim, could someone give an example?

Second I'm having troubles installing mod_layout with the rpm, could anyone help me with this? If so please aim or pm. I'll be on most of the night. I will compensate any help for either issue!
exim.conf help, need to block email sent through server from 1 server ip

 

 

 

 

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