mta005.ucded.lnmailer.net has no SRV records.
Question and response
Question
dig mta005.ucded.lnmailer.net. SRV
Answer
The response has no answer records.
Authority
lnmailer.net. 3600 SOA ns1.viidakko.fi. admin.dnsimple.com. 1727957529 86400 7200 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0