| Name | Description | Type | Package | Framework |
| CommonsmailHelper | Creates a MultiPartEmail. | Interface | ninja-core.ninja.postoffice.commonsmail | Spark Micro Web |
| CommonsmailHelperImpl | Class | ninja-core.ninja.postoffice.commonsmail | Spark Micro Web | |
| It is modeled after org. | Interface | ninja-core.ninja.postoffice | Spark Micro Web | |
| MailImpl | Simple implementation of Mail. | Class | ninja-core.ninja.postoffice.common | Spark Micro Web |
| Postoffice | Simply takes a Mail and sends it. | Interface | ninja-core.ninja.postoffice | Spark Micro Web |
| PostofficeCommonsmailImpl | Class | ninja-core.ninja.postoffice.commonsmail | Spark Micro Web | |
| PostofficeConstant | Interface | ninja-core.ninja.postoffice.guice | Spark Micro Web | |
| PostofficeMockImpl | Class | ninja-core.ninja.postoffice.mock | Spark Micro Web | |
| PostofficeProvider | Class | ninja-core.ninja.postoffice.guice | Spark Micro Web | |
| Tuple | Simple tuple class for convenience. | Class | ninja-core.ninja.postoffice.common | Spark Micro Web |