postmaster.validsender.link has no SRV records.
Question and response
Question
dig postmaster.validsender.link. SRV
Answer
The response has no answer records.
Authority
validsender.link. 1800 SOA kim.ns.cloudflare.com. dns.cloudflare.com. 2396765517 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0