lettre 0.10.0-rc.6

// This line is only to make it compile from lettre's examples folder,
// since it uses Rust 2018 crate renaming to import tokio.
// Won't be needed in user's code.
use lettre::{
    transport::smtp::authentication::Credentials, AsyncSmtpTransport, AsyncTransport, Message,
    Tokio1Executor,
};
use tokio1_crate as tokio;

#[tokio::main]
async fn main() {
    tracing_subscriber::fmt::init();

    let email = Message::builder()
        .from("NoBody <nobody@domain.tld>".parse().unwrap())
        .reply_to("Yuin <yuin@domain.tld>".parse().unwrap())
        .to("Hei <hei@domain.tld>".parse().unwrap())
        .subject("Happy new async year")
        .body(String::from("Be happy with async!"))
        .unwrap();

    let creds = Credentials::new("smtp_username".to_string(), "smtp_password".to_string());

    // Open a remote connection to gmail using STARTTLS
    let mailer: AsyncSmtpTransport<Tokio1Executor> =
        AsyncSmtpTransport::<Tokio1Executor>::starttls_relay("smtp.gmail.com")
            .unwrap()
            .credentials(creds)
            .build();

    // Send the email
    match mailer.send(email).await {
        Ok(_) => println!("Email sent successfully!"),
        Err(e) => panic!("Could not send email: {:?}", e),
    }
}