portuguese.astro4dev.org has no MX records.
Question and response
Question
dig portuguese.astro4dev.org. MX
Answer
The response has no answer records.
Authority
astro4dev.org. 3600 SOA NS15.WORLDNIC.COM. namehost.WORLDNIC.COM. 126012307 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0