Rust send smtp email by Zoho code example

main.rs

// === In Cargo.toml file======
// lettre = "0.9.2"
// lettre_email = "0.9.2"
// native-tls = "0.2.3"
// ============================

use lettre_email::Email;
use lettre::smtp::authentication::Credentials;
use lettre::{ClientSecurity, ClientTlsParameters, SmtpClient, Transport};
use native_tls::TlsConnector;

fn main() {
    let creds = Credentials::new(
        "[email protected]".to_string(),
        "password".to_string(),
    );

    let mail = Email::builder()
        .to("[email protected]")
        .from("[email protected]")
        .subject("Subject")
        .body("Body Content")
        .build();

    let connector = TlsConnector::new().unwrap();
    let tls_params = ClientTlsParameters::new("smtp.zoho.com".to_string(), connector);

    let security = ClientSecurity::Wrapper(tls_params);

    let mut mailer = SmtpClient::new("smtp.zoho.com:465", security)
        .unwrap()
        .credentials(creds).transport();

    mailer.send(mail.unwrap().into()).unwrap();
}