link.sendsay.com has no MX records.
Question and response
Question
dig link.sendsay.com. MX
Answer
The response has no answer records.
Authority
sendsay.com. 3600 SOA ns.iprojects.ru. noc.sendsay.com. 2022060101 10800 1100 864000 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0