Using Free KEMP
Exchange 2016 with multiple receive connectors
Since installing Kemp (Hyper-V) I have noticed that any time one of our SMTP server that are allowed to send email to external address (i.e. monitoring services, Send to fax) that normally worked when connecting directly to the Exchange server, are being refused to relay anymore, getting in the log a "550 5.7.54 SMTP; Unable to relay recipient in non-accepted domain" message when going via the KEMP.
I am using the Kemp Template for Exchange 2016 SMTP.
Any idea what I should look for to troubleshoot/correct this problem?
Thanks in advance for any help/tips