mx.ptmail.sapo.pt has no MX records.
Question and response
Question
dig mx.ptmail.sapo.pt. MX
Answer
The response has no answer records.
Authority
ptmail.sapo.pt. 3600 SOA dns01.sapo.pt. root.ns.sapo.pt. 1771644685 800 200 604800 300
Additional
The response has no additional records.