https://tech90.com/2012/03/21/how-do-i-block-an-email-address-on-icloud/

With regard to the nature of your problem with the trackbacks, trackbacks can usually be whitelisted or blacklisted by the blog itself. You can search for plugins for various blogging platforms that can help to do that. Just as an FYI, the 192.168.0.10 IP address is a local network address only, so trying to filter based on that will not unfortunately work the way you are hoping it to. For example, if you are using WordPress here is a great article about trackback spam and suggestions about dealing with it:

http://www.dailyblogtips.com/how-to-stop-trackback-spam-on-wordpress/

Let me know if I can provide any additional information for you.

GM

My problem has been getting “trackbacks” from a single IP address (192.168.0.10 ) on my blog posts. I put the IP address in the “Rules” space instead of an email address, which seemed to vary. (I get 8 to 12 of these “trackback” emails a day.) We’ll see if that works.

Another source has said to go to an “.htacess” file at my server and enter an “order deny” instruction, but I don’t know how to do that and have not been able to get any information on that from Apple or iCloud sources on the web.