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),
}
}