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https://wiki.ihor.ru/cpanel:%D0%BA%D0%B0%D0%BA_%D1%81%D0%BC%D0%B5%D0%BD%D0%B8%D1%82%D1%8C_mx-%D0%B7%D0%B0%D0%BF%D0%B8%D1%81%D1%8C
Как сменить MX-запись