The lowest preference value indicates the most preferred mail server.When email is received, it tries each mail server in order until one of them accepts the email.The lowest number means the highest server preference.
are also commonly also known as the Mail Exchanger Records.
When people refer to Mail Hub, Postoffice or Mail Host they are referring to the machine that the MX Records point to.
Normally, it takes 30 minutes for newly created records to take effect. If you have any questions, feel free to contact our Support Team.
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A lot of companies who have multiple mail servers use the same preference value in attempts to load balance their mail servers.