Probably the easiest way to do this is modify the rule in the firewall and disable outbound smtp except for internal IP addresses.
From: [email protected] [mailto:[email protected]] On Behalf Of Gannon, Todd Sent: Wednesday, November 18, 2015 10:52 PM To: [email protected] Subject: [Exchange] Disable Test servers sending email external Hello - I was wondering if this is possible. We have a bunch of test servers that we need to disable sending email to the internet via their ip address or hostname. Internal email should be allowed to flow. I have been messing around with transport rules but cant seem to get the configuration right. Could this be done at the connector level? If so, how? This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this mail in error please notify the originator of the message. This footer also confirms that this email message has been scanned for the presence of computer viruses. Any views expressed in this message are those of the individual sender, except where the sender specifies and with authority, states them to be the views of the CBH Group.
