If you have a website that is in case of false positive categorized as “Malicious Site” or a wrong category, you can open a support case by writing an email to sites@mcafee.com or via the website https://www.trustedsource.org/en/feedback/url from McAfee. Sophos UTM is also using this global database. In Sophos UTM 9.2 you have the ability to overwrite those settings in the configuration but I would use this only temporary.