This container can be pulled via:
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/fetchmail:6.5.4
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/fetchmail:6.5.4-5.148
  docker pull registry.opensuse.org/opensuse/factory/zsystems/totest/containers/opensuse/fetchmail:latest

Set DOCKER_CONTENT_TRUST=1 to enable image tag verification.