mailrelay01.virginmobile.com has no SRV records.
Question and response
Question
dig mailrelay01.virginmobile.com. SRV
Answer
The response has no answer records.
Authority
virginmobile.com. 3600 SOA nsgbr.comlaude.co.uk. dnstech.comlaude.com. 2021111117 86400 7200 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0