smtps.faster.cz has no MX records.
Question and response
Question
dig smtps.faster.cz. MX
Answer
The response has no answer records.
Authority
faster.cz. 900 SOA inet.faster.cz. hostmaster.faster.cz. 2026022016 16384 2048 1209600 900
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0