Hi,
You could add a sendergroup under Mail Policies -> HAT Overview with the IP's and hostnames you would like to limit to the local domain and then add a message filter to look at the recipient domain.
Local_Domain:
if (sendergroup == "NameOfSendergroup") AND (rcpt-to != "@localdomain.com")
{
log-entry("Sender IP not allowed to send to this domain");
quarantine("Policy");
}
The filter would quarantine any email from the added IP's which are not intended for the mentioned local domain.
It is recommended you test the filter before bringing it into production to ensure it matches your requirement.
Regards,
Libin Varghese
