Rust发送邮件，带SSL

引入依赖：

lettre = "0.10"

代码部分

默认端口为：465

extern crate lettre;

use lettre::transport::smtp::authentication::{Credentials, Mechanism};
use lettre::{Message, SmtpTransport, Transport};

fn main() {

    // 设置SMTP服务器信息
    let smtp_server = "smtp.exmail.qq.com";
    let smtp_username = "smtp_username";
    let smtp_password = "password";

    // 设置发件人和收件人
    let from_address = "from_email_address";
    let to_address = "to_email_address";

    use lettre::transport::smtp::authentication::Credentials;
    use lettre::{Message, SmtpTransport, Transport};

    let email = Message::builder()
        .from(from_address.parse().unwrap())
        .to(to_address.parse().unwrap())
        .subject("Sending email with Rust")
        .body(String::from("This is my first email"))
        .unwrap();

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

    // Open a remote connection to gmail
    let mailer = SmtpTransport::relay(smtp_server)
        .unwrap()
        .credentials(creds)
        .build();

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

}