smtp – Ask MS to whitelist my mail server. I received an answer that I do not understand. Can someone throw me a clue?

The text is below.

I have no idea what that means. Did they do something? Should I do something?

Please note that the number of your ticket is in the subject line of this mail.

nnn.nnn.nnn.nnn / 32 (nnn.nnn.nnn.nnn is the IP address of my mail server)

Note: Errors are unlikely. However, if an error is indicated, please resubmit the specific IP address or IP range.

Thank you,