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.