Updated on 2023-03-16 GMT+08:00

Adding an MX Record Set


If you want to map email servers to a domain name, you can add MX record sets.

For details about other types of record sets, see Record Set Types and Configuration Rules.


You have deployed an email server and obtained its domain name.


  1. Log in to the management console.
  2. Hover the cursor over in the upper left corner. In the service list, choose Networking > Domain Name Service.

    The DNS console is displayed.

  1. In the navigation pane, choose Public Zones or Private Zones.

    The zone list is displayed.

  2. (Optional) If you have selected Private Zones, click on the upper left corner to select the region and project.
  3. Click the domain name.
  4. Click Add Record Set.

    The Add Record Set dialog box is displayed.

  1. Configure the parameters based on Table 1.
    Table 1 Parameters for adding an MX record set



    Example Value


    Prefix of the domain name to be resolved.

    For example, if the domain name is example.com, the prefix can be as follows:

    • www: The domain name is www.example.com, which is usually used for a website.
    • Left blank: The domain name is example.com.

      In some cases, you may need to set the record set name to the at sign (@). However, the at sign is not supported. Leave the Name blank.

    • abc: The domain name is abc.example.com, a subdomain of example.com.
    • mail: The domain name is mail.example.com, which is typically used for an email server.
    • *: The domain name is *.example.com, which is a wildcard domain name, indicating all subdomains of example.com.

    Left blank


    Type of the record set

    If a message is displayed indicating that the record set you are trying to create exists, the record set conflicts with an existing record set.

    For details, see Why Is a Message Indicating Conflict with an Existing Record Set Displayed When I Add a Record Set?

    MX – Map domains to email servers


    Resolution line.

    The DNS server will return the IP address of the specified line, depending on where the visitors come from.

    This parameter is supported only for public domain names.

    • Default: returns the default resolution result irrespective of where the visitors come from.
    • ISP: returns the resolution result based on visitors' carrier networks. For details, see Configuring ISP Lines.
    • Region: returns the resolution result based on visitors' geographical locations. For details, see Configuring Region Lines.


    TTL (s)

    Cache duration of the record set on a local DNS server, in seconds.

    The value ranges from 300 to 2147483647, and the default is 300.

    If your service address changes frequently, set TTL to a smaller value.

    Learn more about TTL.

    The default value is 300s, which is, 5 minutes.


    Email server address

    You can enter a maximum of 50 record values, each on a separate line.

    The format is [priority][mail server host name].

    Configuration rules:
    • priority: priority for an email server to receive emails. A smaller value indicates a higher priority.
    • mail server host name: domain name provided by the email service provider

    10 mailserver.example.com.


    (Optional) Weight of a record set. The value ranges from 0 to 1000, and the default value is 1.

    This parameter is supported only for public domain names.

    If a resolution line in a zone contains multiple record sets of the same type, you can set different weights to each record set. For details, see Configuring Weighted Routing.



    (Optional) Identifier of the record set. This parameter is displayed when you expand More Settings.

    Each tag contains a key and a value. You can add a maximum of 10 tags to a record set.

    For details about tag key and value requirements, see Table 2.




    (Optional) Supplementary information about the record set.

    You can enter a maximum of 255 characters.


    Table 2 Tag key and value requirements



    Example Value


    • Cannot be left blank.
    • Must be unique for each resource.
    • Can contain a maximum of 36 characters.
    • Cannot start or end with a space or contain special characters =*<>\,|/



    • Cannot be left blank.
    • Can contain a maximum of 43 characters.
    • Cannot start or end with a space or contain special characters =*<>\,|/


  2. Click OK.
  3. Switch back to the Record Sets page.

    View the added record set in the record set list of the zone and ensure that its status is Normal.