Adding an MX Record Set

Scenarios

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

For more information about each type of record sets, see Record Set Types and Configuration Rules.

Prerequisites

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

Procedure

Go to the DNS console.
In the navigation pane on the left, choose Public Zones or Private Zones.
The zone list is displayed.
(Optional) If you have selected Private Zones, click on the upper left corner to select the region and project.
Locate the zone and click Manage Record Set in the Operation column.
Click Add Record Set.
The Add Record Set dialog box is displayed.

Configure the parameters based on Table 1.

**Table 1** Parameters for adding an MX record set
Parameter	Description	Example Value
Name	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. To use an at sign (@) as the domain name prefix, just leave this parameter blank. abc: The domain name is abc.example.com, a subdomain of example.com. mail: The domain name is mail.example.com, which is usually used for email servers. : The domain name is .example.com, which is a wildcard domain name, indicating all subdomains of example.com.	Left blank
Type	Type of the record set A message may be displayed indicating that the record set you are trying to add 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
Line	Resolution line. The DNS server will return the IP address of the specific line, depending on where the visitors come from. This parameter is only configurable for public zone record sets. 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.	Default
TTL (s)	Cache duration of the record set on a local DNS server, in seconds. The value ranges from 1 to 2147483647, and the default value is 300. If your service address changes frequently, set TTL to a smaller value. Learn more about TTL.	300
Value	Email server address You can enter up to 50 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.
Weight	(Optional) Weight for the record set. The value ranges from 0 to 1000, and the default value is 1. This parameter is only configurable for public zone record sets. 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.	1
Tag	(Optional) Identifier of the record set. Each tag contains a key and a value. You can add up to 20 tags to a record set. For details about tag key and value requirements, see Table 2.	example_key1 example_value1
Description	(Optional) Supplementary information about the record set. The description can contain no more than 255 characters.	-

**Table 2** Tag key and value requirements
Parameter	Requirements	Example Value
Key	Cannot be left blank. Must be unique for each resource. Can contain no more than 36 characters. Cannot start or end with a space nor contain special characters =*<>\,\|/	example_key1
Value	Cannot be left blank. Can contain no more than 43 characters. Cannot start or end with a space nor contain special characters =*<>\,\|/	example_value1