nitrogen.avevad.com has no MX records.
Question and response
Question
dig nitrogen.avevad.com. MX
Answer
The response has no answer records.
Authority
avevad.com. 1800 SOA curitiba.ns.porkbun.com. dns.cloudflare.com. 2394873053 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0