returnPathArn

This parameter is used only for sending authorization. It is the ARN of the identity that is associated with the sending authorization policy that permits you to use the email address specified in the ReturnPath parameter.

For example, if the owner of example.com (which has ARN arn:aws:ses:us-east-1:123456789012:identity/example.com) attaches a policy to it that authorizes you to use feedback@example.com, then you would specify the ReturnPathArn to be arn:aws:ses:us-east-1:123456789012:identity/example.com, and the ReturnPath to be feedback@example.com.

Instead of using this parameter, you can use the X-header X-SES-RETURN-PATH-ARN in the raw message of the email. If you use both the ReturnPathArn parameter and the corresponding X-header, Amazon SES uses the value of the ReturnPathArn parameter.

For information about when to use this parameter, see the description of SendRawEmail in this guide, or see the Amazon SES Developer Guide.