DNS Lookup
Every deliverability control lives in DNS. This is a quick way to read the actual records a domain is publishing, straight from the resolver.
How it works
Pick a record type and we query it live over DNS-over-HTTPS. TXT holds SPF/DKIM/DMARC, MX holds mail servers, A/AAAA hold IPs, CNAME holds aliases, NS holds the nameservers. What you see is what receivers see.
Authentication is step one.
Once your records check out, inbox placement still depends on reputation and warmup. Scheduler Zero handles both. Need to fix a record first? See the per-host setup guides.