Hi All,
i have enabled the following Global MTA settings:

Enable authentication
TLS authentication only
Protocol checks:
Hostname in greeting violates RFC (reject_invalid_hostname)
Client must greet with a fully qualified hostname (reject_non_fqdn_hostname)
Sender address must be fully qualified (reject_non_fqdn_sender)
DNS checks:
Client's IP address (reject_unknown_client)
Hostname in greeting (reject_unknown_hostname)
Sender's domain (reject_unknown_sender_domain)

If a messages is rejected by these is the sender informed & is there a log