mailer.websms.com has no MX records.
Question and response
Question
dig mailer.websms.com. MX
Answer
The response has no answer records.
Authority
websms.com. 600 SOA ns1.easyname.eu. hostmaster.easyname.eu. 2025111401 10800 3600 604800 600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0