## Submission


A submission is one message passed to one transport once.


Usage

``` python
Submission(
    message,
    from_address,
    message_id,
    date,
)
```


Only [Connection.send](Connection.md#epistole.Connection.send) builds one. Sending a message twice makes two submissions with two ids, because identity belongs to the send. See ADR-0015.


## Attributes


`message: Message`  
The message as the caller built it.

`from_address: str`  
The backend's from address, which a [Message](Message.md#epistole.Message) never carries.

`message_id: str`  
The `Message-ID` Epistole generated, with its angle brackets.

`date: datetime`  
The `Date` Epistole set, timezone-aware in the sending machine's offset.