potomact062.mktosender.com has no SRV records.
Question and response
Question
dig potomact062.mktosender.com. SRV
Answer
The response has no answer records.
Authority
mktosender.com. 1800 SOA ns1.marketo.com. ops.localhost. 2025090901 1800 1800 604800 1800
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0