ok, that's close my research
if it's only for on prem Exchange, I'll leave the identification by IP Address
thanks for your time !!

clients will contact smtp hmailserver on port 25, no auth, no SSL. and then hmailserver relay to O365 with TLS on port 25 also (that works) In the Microsoft Connector set up on O365, you choose if you want to identify your relay/server with its IP address or with certificate. This is the second opti...

hi all, I have set up hmailserver as an internal SMTP Relay to Office 365. It works fine in TLS1.2 with O365, and it is identified by Microsoft authorized server by it's public IP. I would like to authorize it with an SSL Certificate. I can't find where I should set it in hmailserver to work ? I don...