Письма от определенных отправителей задерживаются

По какой-то причине электронные письма от отправителей, которые отправляют электронное письмо через Outlook (Microsoft SMTP Server), всегда задерживаются. Я прикрепил часть заголовка электронного письма ниже, в котором говорится, что письмо было отправлено «Пт, 22 декабря 2017 г., 12:04:07» и получено получателем «24 декабря 2017 г., 09:35:51». Я пытаюсь понять, связано ли это с сервером получателей.

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Date: Fri, 22 Dec 2017 12:04:07 +0000