Currently mail disclaimer is getting added to each and every SMTP outgoing mails. In our case we are using Google cloud host & hosted 50% internal users with the same domain name. Routing between On-Premises & Google cloud is via SMTP.
By enabling the disclaimer by design its also getting added for cloud users as well.
To avoid this we have a requirement to exclude specific domains for adding disclaimer in the every outgoing SMTP mails. Like with this feature we can exclude few domains as per our requirement.