1. Seems like all the registrations are made from AS45727 (PT Hutchison CP Telecommunications), - if

  1. Seems like all the registrations are made from AS45727 (PT Hutchison CP Telecommunications), - if you're not otherwise seeing legitimate traffic from that ISP, you could filter on the AS number.
  2. A quick glance makes all the IP addresses appear to be from Indonesia, if you're not otherwise seeing (or expecting) legitimate traffic from Indonesia, you could filter traffic from Indonesia away.
  3. Searching "fextemp.com" (including the quotes), on Google, leads to various sites confirming as you say, that they (@fextemp.com) are disposable emails.
    One result that search is bringing, would be https://github.com/MISP/misp-warninglists/blob/main/lists/disposable-email/list.json, which seem to contain a few thousand domains, that are apparently disposable email address domains.
Such as through the link from #3, you can pick up such lists of disposable email address domains, and block them from registering in your system. How you can do that would be a problem between you, and your registration system (in other words, not something you can do directly through Cloudflare).
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