curl --request GET \
  --url https://mail-service.iran.liara.ir/api/v1/mails/{mailServerID}/metrics \
  --header 'Authorization: <api-key>'

{
  "status": "<string>",
  "data": {
    "metrics": {
      "messagesCountToday": 123,
      "messagesCountThisMonth": 123
    }
  }
}