Hi list,

I'd like to configure Postfix such that I can prevent certain IP's/networks 
from sending email to 'external' recipients. I'm basically trying to set it so 
that our dev and test web application servers can't email any domains other 
than our own - so developers can test email functionality without the risk of 
sending email out to 'real' addresses by mistake. 

So I need something that says 'if the server is from this IP/network then only 
allow mail to mydomain.net'. Or more likely, something which says 'these 
internal networks can only send to internal recipients, with the exception of 
these IP's which can also send to external recipients' 

I've done some Googling but can't quite figure the best way to achieve this. 
Grateful for any pointers!

Many thanks,


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