smtp2-3745.messageflow.com has no SRV records.
Question and response
Question
dig smtp2-3745.messageflow.com. SRV
Answer
The response has no answer records.
Authority
messageflow.com. 1800 SOA athena.ns.cloudflare.com. dns.cloudflare.com. 2397753105 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0