Common workflow templates
- Mail bounce: MX → SPF/DKIM/DMARC → DNSBL → SSL on mail host.
- Site down: DNS A/AAAA → HTTP headers → SSL → traceroute.
- Slow site: Ping → traceroute → DNS lookup → speed test.
- Domain migration QA: DNS → WHOIS → SSL → blacklist.
- Reputation review: IP reputation → DNSBL → WHOIS → blacklist.