+++
date = "2017-05-21T23:46:17+02:00"
title = "Stub transport"
toc = true
weight = 5

+++

The stub transport only logs message envelope and drops the content. It can be useful for
testing purposes.

```rust
extern crate lettre;

use lettre::stub::StubEmailTransport;
use lettre::{SimpleSendableEmail, EmailTransport};

fn main() {
    let email = SimpleSendableEmail::new(
                    "user@localhost".to_string(),
                    &["root@localhost".to_string()],
                    "message_id".to_string(),
                    "Hello world".to_string(),
                ).unwrap();
    
    let mut sender = StubEmailTransport::new_positive();
    let result = sender.send(&email);
    assert!(result.is_ok());
}
```

Will log (when using a logger like `env_logger`):

```text
b7c211bc-9811-45ce-8cd9-68eab575d695: from=<user@localhost> to=<root@localhost>
```
