The triage order that works
1. Fix what is clearly yours. If your own domain lacks SPF, DMARC, or correct MX records, that is a configuration task with a known fix — start there before anything else.
2. Check exposure you control. Software listed in a government exploited-vulnerability catalog and running on your systems is a patching priority, not an anxiety item. Catalog entries include the affected product for exactly this reason.
3. Watch, then block. For an address showing abusive behavior, match it against your own logs first. If it appears, block or rate-limit it at your firewall or edge — evidence-based, reversible, and documented.
