MX Record Lookup
MX records tell other servers where to deliver mail for your domain. A domain with no MX cannot receive replies or bounces, which makes it look abandoned to mailbox providers.
How it works
We query the domain's MX records live over DNS-over-HTTPS and list them by priority (lower number is tried first). No MX records means inbound mail has nowhere to go. The hostnames must themselves resolve to real servers.
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.