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# Stub transport

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

use lettre::stub::StubEmailTransport; use lettre::{SimpleSendableEmail, EmailTransport, EmailAddress}; let email = SimpleSendableEmail::new( EmailAddress::new("user@localhost".to_string()), vec![EmailAddress::new("root@localhost".to_string())], "message_id".to_string(), "Hello world".to_string(), ); let mut sender = StubEmailTransport::new_positive(); let result = sender.send(&email); assert!(result.is_ok());

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

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