Exim host blocking on shared server

I am setting up spamarrest for a domain hosted on my dedicated server, which I use to host my customers (many) website/emails. It is a cpanel based system, running exim 4.50.

What I need to do is tell exim, that for domain X, to only allow mail for domain X to be received from the spamarrest server (by dns name ideally). This effectively will only allow mail coming in that has passed through the spamarrest filtering system.

I know how to do this in exchange, but not in Exim.

The trick here is I need to do this for only the one domain for this customer, I dont want this for the other domains/customers on this server. All the other domains need to be able to receive mail from people/servers on the internet normally.

The reason for this is if I do not only allow mail that has passed through spamarrest first, many spammers connect directly to mail.domainx.com and would bypass spamarrest.

 

 

 

 

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