mail3.ptdes.net has no MX records.
Question and response
Question
dig mail3.ptdes.net. MX
Answer
The response has no answer records.
Authority
ptdes.net. 3600 SOA hosting.ptdes.net. hostmaster.des.net.id. 2025092901 1800 3600 1209600 7200
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0