List a domain's mail servers in preference order and detect null MX (RFC 7505) and MX targets that do not resolve, with coded findings. Use when an agent must find where mail for a domain is delivered or why a domain cannot receive mail.
| Network | Scheme | Amount | Pay To |
|---|---|---|---|
| Base | exact | $0.01 USDC | 0x5bE2...Bc05 |