I am in a need of implementing solution where certain users from say example.com would not be able to send any email out to external domains however they will be able to do the local delivery i.e example.com
I was searching though Wiki/forum and found this article. So would like to know if anyone has ever implemented this?
e.g email@example.com PASSED Can Go
firstname.lastname@example.org FAILED CAN NOT GO
stop outbound external mail