You must add a BATV exception for the domain "domain.be". We have the same problem with few domains. When you send a mail to those domains, their mail server try to connect back to your mail server to verify the sender mail address, but it fails because of BATV.
You must add a BATV exception for the domain "domain.be". We have the same problem with few domains. When you send a mail to those domains, their mail server try to connect back to your mail server to verify the sender mail address, but it fails because of BATV.