I have an Exchange server (not configured by me) with 3 receive connectors: Client, Default and "My internet connector". The server has one IP=192.168.255.1
Default -> bind: 0.0.0.0:25, :::25; Permission groups: Anonymous/Exchange users, Exchange servers, Legacy Exchange servers
My internet connector -> bind: 192.168.255.1:25; Permission groups: Anonymous/Exchange users, Exchange servers, Legacy Exchange servers
They both have the same FQDN: MYSERVER.DOMAIN.COM
I've disabled "Anonymous exchange users" from Default connector, and sending an email from Gamil fails with "server requires authentication". So, it's using Default connector to receive from the internet
Question: How does Exchange select a receive connector? How can I make it use "My internet connector" to receive inbound mail from the Internet?