We have a number of sites in a large AD.
I would like users in one specific site to only be allowed to send email to that particular site.
I realise that I can set every other user in the AD to not accept mail from users in this site on a per user basis, but I would like to apply this to just the users in the problem site otherwise management becomes a major pain.
Basically, site A has its own domain name, sitea.com. Site A is not allowed to send email to siteb (siteb.com) or sitec (sitec.com) etc etc.
Any help greatly appreciated, if you need further info ask away