mail2.gestiondecuenta.com has no SRV records.
Question and response
Question
dig mail2.gestiondecuenta.com. SRV
Answer
The response has no answer records.
Authority
gestiondecuenta.com. 300 SOA ns.dinahosting.com. hostmaster.gestiondecuenta.com. 2018083102 3600 120 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0