Hi,
We are hosting our Exchange 2016 server on the premise. When email going out, instead of showing the email coming from the Exchange server IP address, its shown it's from our firewall ip address. For this reason, we have our emails blocked by some recipients' email servers.
We have PTR records of our firewall and Exchange server ip addresses point to our domain name, but still some emails got rejected because of it, especially emails go to msn.com and live.com etc.
Any comment or suggestion will be greatly appreciated.
Thanks
Tee