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Examples of using multiple MX records
These are examples of setting up multiple MX records in the DNS.

Using a single Internet domain with a single domain name

You can specify MX records for a single Internet domain -- for example, acme.com -- with a single Internet domain name, such as acme.com. Use the server's fully-qualified Internet host name in the MX and A records -- for example, mail1.acme.com.

For example, configure a backup SMTP server (mail2.acme.com) to deliver or forward mail when the primary SMTP server (mail1.acme.com) is unavailable:

1. MX record: acme.com IN MX 5 mail1.acme.com


2. MX record: acme.com IN MX 10 mail2.acme.com
Using a single Internet domain name with two balanced servers

If you specify equal preference for two servers, DNS randomly selects a server to balance the load of incoming mail.

1. MX record: acme.com IN MX 5 mail1.acme.com


2. MX record: acme.com IN MX 5 mail2.acme.com
Using a single Internet domain with multiple domain names

You can create MX records for a single Internet domain -- for example, acme.com -- with multiple Internet domain names -- for example, acme.com, qrs.com, and xyz.com.

Note Users can address mail to each domain name and each domain has a backup SMTP server.

1. MX record: acme.com IN MX 5 mail1.acme.com

2. MX record: acme.com IN MX 10 mail2.acme.com

3. MX record: qrs.com IN MX 5 mail1.acme.com

4. MX record: qrs.com IN MX 10 mail2.acme.com

5. MX record: qrs.com IN MX 5 mail1.acme.com

6. MX record: xyz.com IN MX 10 mail2.acme.com

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