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What can cause slow deliveries?

  • Overload at our end,
  • Internet connecion issues,
  • Overload at destination servers (Mail.ru, Yandex.ru, Rambler.ru,...) end,
  • Sudden policy changes at destination servers (Mail.ru, Yandex.ru, Rambler.ru,...) ,
  • Message size (bigger messages = higher bandwidth cost, higher anti-spam processing costs),
  • Users' complaints affecting delivery rates and Sender's reputation

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