mail1.spe.net has no MX records.
Question and response
Question
dig mail1.spe.net. MX
Answer
The response has no answer records.
Authority
spe.net. 600 SOA ns1.spe.net. root.spe.net. 2025082900 86400 3600 604800 600
Additional
. 0 OPT ; payload 2800, xrcode 0, version 0, flags 0