Hi markk96, I did some test. Here is my finding : link.rm0003.net is categorized as web-based email. But since you have put it in allow list, it is accessible. But this site does change to "go.reachmail.net" C:\Users\user>nslookup link.rm0003.net . Name: go.reachmail.net <------ Address: 66.251.253.150 Aliases: link.rm0003.net <----- go.reachmail.net is categorized as computer and info and that is why it is getting allowed. There are 2 options, for the short term, you can put go.reachmail.net in block list : go.reachmail.net *.go.reachmail.net In the long run, you can request re-categorization for the url category to change it to web-based-email as well. If you are using PAN-DB you can go to following site Palo Alto Networks URL Filtering - Test A Site You can go to brightclould site if you are using BC as your URL filtering vendor. Hope this helps. Thank you.
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