Check email ban status

curl --request POST \
  --url https://api.fluxer.app/v1/admin/bans/email/check \
  --header 'Authorization: <api-key>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "jsmith@example.com"
}
'

{
  "banned": true
}