Hello,
Question about hybrid environment ports.
Is this the list of ports and IP addresses needed to open for on-prem<-->o365 hybrid environment?:
443,25 on-prem ports only to O365 IP addresses?
Questions:
Does this O365 addresses changes frequently?
Is there an easy way to make this rules on firewall?
Someone mention JSON list to import in FW
https://forum.opnsense.org/index.php?topic=19472.0
This ports must be opened from on-prem exchange to O365 because:
"on premise Email Security Appliance integration with O365 is not supported."
So,mail flow between O365 and on-prem exchange must bypass anti-spam because it is not supported by Microsoft?
Any advice about O365<-->on-prem exchange ports needed to be open for hybrid environment?
Thank you