Otto Bittner b1b8571877 validation: use regex instead of dns lookup
Doing a DNS lookup may fail for domain names that are valid
but currently not assigned.
The old test also breaks inside the bazel sandbox.
2023-11-08 14:43:05 +01:00
..
2023-11-03 15:47:03 +01:00
2023-11-03 15:47:03 +01:00