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Thread: mx records

  1. #1
    Join Date
    Aug 2003
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    Twin Cities Area
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    5,651

    * mx records

    i know you can select a variety of numbers for your mx record preference. but what should that number really be and how do you determine that?

    TIA
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  2. #2
    Join Date
    Mar 2003
    Location
    Saint Paul, MN
    Posts
    826
    The numbers must be integers between 0 and... I'm not sure what the upper limit is, or if there is one. 999? The only significance is that lower-numbered MX records have higher priority, and are tried first. Most people seem to use 10 or 20, and if they have multiple MX records, increment each one by 10, but there's no reason you can't start at 0 or 1 and go up by single digits... or just use 42.
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  3. #3
    the 10 versus the 20, is a way to set load sharing and priority between multiple mail servers for a domain. The lower preference number is the higher priority. Two MX records with the same priority will share the workload (typically used in large ISP mail server installations). The server with the higher preference number will be contacted only if the servers with lower preference number are unavailable (this is typically used for backup mail servers).

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