smtp.iguana.cat has no MX records.
Question and response
Question
dig smtp.iguana.cat. MX
Answer
The response has no answer records.
Authority
iguana.cat. 38400 SOA ns1.iguana.cat. sistemes.somvera.cat. 2025101301 10800 3600 648000 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0