Changes to Create an Email activity

added the optional property attachments/anyOf[subschema #1]/items/content_id to the response with the 200 status

added the optional property attachments/anyOf[subschema #1]/items/inline_only to the response with the 200 status

added the media type application/json for the response with the status 400

added the media type application/json for the response with the status 401

added the non-success response with the status 403

added the non-success response with the status 429

removed the non-success response with the status 404

added the optional property created_by_agent_id to the response with the 200 status

response property agent_config_id deprecated

added the required property send_attempts/anyOf[subschema #1]/items/date to the response with the 200 status

added the required property send_attempts/anyOf[subschema #1]/items/error_class to the response with the 200 status

added the required property send_attempts/anyOf[subschema #1]/items/error_message to the response with the 200 status

added the required property opens/anyOf[subschema #1]/items/ip_address to the response with the 200 status

added the required property opens/anyOf[subschema #1]/items/opened_at to the response with the 200 status

added the required property opens/anyOf[subschema #1]/items/opened_by to the response with the 200 status

added the required property opens/anyOf[subschema #1]/items/user_agent to the response with the 200 status

removed the request property account_id

added the new optional request property email_account_id

removed the request property created_by_id

added the new optional request property created_by