mx2.mas.t-systems-service.com has no SRV records.
Question and response
Question
dig mx2.mas.t-systems-service.com. SRV
Answer
The response has no answer records.
Authority
mas.t-systems-service.com. 3600 SOA ns1.mas.t-systems-service.com. secure-email.t-systems.com. 2026013001 600 3600 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0