Hi Guys,
We have Exchange 2013 standard with latest CU installed on our premises, but we are facing an error with one specific domain.
When a mailbox in an specific domain send a mail to one of our mailboxes, it get the error 554 5.7.1 This message has been blocked because the HELO/EHLO domain is invalid.
Also, when we do a diagnostic test from mxtoolbox, we get the same error.
I have setup the fqdn in the send conector and also in the receive conector.
Is there anything i can check to fix that issue.
i'll appreciate any help you can give me.
Regards,