Forum Discussion
Exchange 2019 test shows I'm open relay
I have an Exchange 2019 hybrid environment. A recent test using the usual telnet to exchange and sending an email from outside to outside shows I'm open relay. I look at the default frontend server...
Run the following command to list all receive connectors and their properties:
Get-ReceiveConnector | Format-List Identity,PermissionGroups,RemoteIPRanges
Ensure that the RemoteIPRanges property for each receive connector is appropriately configured.
You can modify the IP ranges using the Set-ReceiveConnector cmdlet.
Get-ReceiveConnector | Format-List Identity,PermissionGroups,RemoteIPRanges
Ensure that the RemoteIPRanges property for each receive connector is appropriately configured.
You can modify the IP ranges using the Set-ReceiveConnector cmdlet.
Thanks. Should I only be looking for the connectors that are port 25 since that's smtp?
Default Frontend [server] port 25 has custom ip ranges
Client Frontend [server] port 587 has all remote ranges
Client Proxy [server] port 465 has all remote ranges
Default [server] port 2525 has all remote ranges
Outbound Proxy Frontend [server] port 717 has all remote ranges.
Which one should I be suspecting?
Default Frontend [server] port 25 has custom ip ranges
Client Frontend [server] port 587 has all remote ranges
Client Proxy [server] port 465 has all remote ranges
Default [server] port 2525 has all remote ranges
Outbound Proxy Frontend [server] port 717 has all remote ranges.
Which one should I be suspecting?
