spamfilter.stellarllc.net has no SRV records.
Question and response
Question
dig spamfilter.stellarllc.net. SRV
Answer
The response has no answer records.
Authority
stellarllc.net. 60 SOA ns1.stellarllc.net. dnsadmin.gctel.net. 2026021600 43200 3600 360000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0