I have encountered a problem that a company refuse to accept our emails because our host name and the client's resolved name is different. Our Exchange server is go directly out the internet with NAT. Could I change the outgoing DNS name of my Exchange using the SMTP Virtual Server -> Delivery -> Advanced -> Full qualified domain name.
My client is using Exchange RPC (RPC over http) to synchronzie the local mailbox rather than using the POP3 and SMTP to send or receive the email. Do this setting help or not ?
Message return by the client is :
<xxxxx.YYYYYYYYY #5.7.1 smtp;554 5.7.1 1111.2222.3333.4444 Message refused. Your host name(xxxxx.ZZZZZZ) dosen't match with your IP address>