spf.ivcert.net has no MX records.
Question and response
Question
dig spf.ivcert.net. MX
Answer
The response has no answer records.
Authority
ivcert.net. 1800 SOA ns1.ivnosys.net. sistemas.ivnosys.com. 1770886836 7200 1800 1209600 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0