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A fully qualified domain name (FQDN) in the certificate request.

The domain name that you want ACM to use to send you validation emails. This domain name is the suffix of the email addresses that you want ACM to use. This must be the same as the DomainName value or a superdomain of the DomainName value. For example, if you request a certificate for testing.example.com, you can specify example.com for this value. In that case, ACM sends domain validation emails to the following five addresses: