mx16d.antispameurope.com has no SRV records.
Question and response
Question
dig mx16d.antispameurope.com. SRV
Answer
The response has no answer records.
Authority
antispameurope.com. 1800 SOA hank.ns.cloudflare.com. dns.cloudflare.com. 2395253637 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0