I want to block any email send from the accounts under the domain internal.mydomain.com that are sent to any any external email. Example:
Sender -> Receiver -> Result
[email protected] ->
[email protected] -> OK
[email protected] ->
[email protected] -> OK
[email protected] ->
[email protected] -> OK
[email protected] ->
[email protected] -> OK
[email protected] ->
[email protected] -> OK
[email protected] ->
[email protected] -> OK
[email protected] ->
[email protected] -> OK
[email protected] ->
[email protected] -> BLOCKED
how can I achieve that?
That should really be handled on the SMTP server.