# RegisterMailDomain
**Important**
End of support notice: On March 31, 2027, AWS will end support for Amazon WorkMail. After March 31, 2027, you will no longer be able to access the WorkMail console or WorkMail resources. For more information, see [Amazon WorkMail end of support](https://docs.aws.amazon.com/workmail/latest/adminguide/workmail-end-of-support.html).
Registers a new domain in WorkMail and SES, and configures it for use by WorkMail. Emails received by SES for this domain are routed to the specified WorkMail organization, and WorkMail has permanent permission to use the specified domain for sending your users' emails.
## Request Syntax
```
{
"ClientToken": "string",
"DomainName": "string",
"OrganizationId": "string"
}
```
## Request Parameters
For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).
The request accepts the following data in JSON format.
** [ClientToken](#API_RegisterMailDomain_RequestSyntax) **
Idempotency token used when retrying requests.
Type: String
Length Constraints: Minimum length of 1. Maximum length of 128.
Pattern: `[\x21-\x7e]+`
Required: No
** [DomainName](#API_RegisterMailDomain_RequestSyntax) **
The name of the mail domain to create in WorkMail and SES.
Type: String
Length Constraints: Minimum length of 3. Maximum length of 209.
Pattern: `[a-zA-Z0-9.-]+`
Required: Yes
** [OrganizationId](#API_RegisterMailDomain_RequestSyntax) **
The WorkMail organization under which you're creating the domain.
Type: String
Length Constraints: Fixed length of 34.
Pattern: `^m-[0-9a-f]{32}$`
Required: Yes
## Response Elements
If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.
## Errors
For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).
** InvalidParameterException **
End of support notice: On March 31, 2027, AWS will end support for Amazon WorkMail. After March 31, 2027, you will no longer be able to access the WorkMail console or WorkMail resources. For more information, see [Amazon WorkMail end of support](https://docs.aws.amazon.com/workmail/latest/adminguide/workmail-end-of-support.html).
One or more of the input parameters don't match the service's restrictions.
HTTP Status Code: 400
** LimitExceededException **
End of support notice: On March 31, 2027, AWS will end support for Amazon WorkMail. After March 31, 2027, you will no longer be able to access the WorkMail console or WorkMail resources. For more information, see [Amazon WorkMail end of support](https://docs.aws.amazon.com/workmail/latest/adminguide/workmail-end-of-support.html).
The request exceeds the limit of the resource.
HTTP Status Code: 400
** MailDomainInUseException **
End of support notice: On March 31, 2027, AWS will end support for Amazon WorkMail. After March 31, 2027, you will no longer be able to access the WorkMail console or WorkMail resources. For more information, see [Amazon WorkMail end of support](https://docs.aws.amazon.com/workmail/latest/adminguide/workmail-end-of-support.html).
The domain you're trying to change is in use by another user or organization in your account. See the error message for details.
HTTP Status Code: 400
** OrganizationNotFoundException **
End of support notice: On March 31, 2027, AWS will end support for Amazon WorkMail. After March 31, 2027, you will no longer be able to access the WorkMail console or WorkMail resources. For more information, see [Amazon WorkMail end of support](https://docs.aws.amazon.com/workmail/latest/adminguide/workmail-end-of-support.html).
An operation received a valid organization identifier that either doesn't belong or exist in the system.
HTTP Status Code: 400
** OrganizationStateException **
End of support notice: On March 31, 2027, AWS will end support for Amazon WorkMail. After March 31, 2027, you will no longer be able to access the WorkMail console or WorkMail resources. For more information, see [Amazon WorkMail end of support](https://docs.aws.amazon.com/workmail/latest/adminguide/workmail-end-of-support.html).
The organization must have a valid state to perform certain operations on the organization or its members.
HTTP Status Code: 400
## See Also
For more information about using this API in one of the language-specific AWS SDKs, see the following:
+ [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/workmail-2017-10-01/RegisterMailDomain)
+ [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/workmail-2017-10-01/RegisterMailDomain)
+ [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/workmail-2017-10-01/RegisterMailDomain)
+ [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/workmail-2017-10-01/RegisterMailDomain)
+ [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/workmail-2017-10-01/RegisterMailDomain)
+ [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/workmail-2017-10-01/RegisterMailDomain)
+ [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/workmail-2017-10-01/RegisterMailDomain)
+ [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/workmail-2017-10-01/RegisterMailDomain)
+ [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/workmail-2017-10-01/RegisterMailDomain)
+ [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/workmail-2017-10-01/RegisterMailDomain)