Hands-On Microservices with Rust

Worker for sending emails

We use a separate thread that receives SendableEmail values and send them using the SMTP protocol. The following code creates an instance of SmtpClient and uses the credentials method to set the credentials for a connection:

fn spawn_sender() -> Sender<SendableEmail> {    let (tx, rx) = channel();    let smtp = SmtpClient::new("localhost:2525", ClientSecurity::None)        .expect("can't start smtp client");    let credentials = ("[e-mail]", "password").into_credentials();    let client = smtp.credentials(credentials);    thread::spawn(move || {        let mut mailer = SmtpTransport::new(client);        for email in rx.iter() {            let result = mailer.send(email);            if let Err(err) = result {                println!("Can't send mail: {}", err);            }        } mailer.close(); ...