uol has no MX records.
Question and response
Question
dig uol. MX
Answer
The response has no answer records.
Authority
uol. 900 SOA a.dns.br. hostmaster.registro.br. 2026066556 1800 900 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0