Чтобы отправить письмо Gmail с помощью кода, вы можете использовать различные языки программирования и библиотеки. Ниже я приведу примеры с использованием Python, JavaScript и PHP.

Python:

import smtplib
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
def send_email(subject, body, to_email, from_email, password):
    message = MIMEMultipart()
    message['Subject'] = subject
    message['From'] = from_email
    message['To'] = to_email
    message.attach(MIMEText(body, 'plain'))
    server = smtplib.SMTP('smtp.gmail.com', 587)
    server.starttls()
    server.login(from_email, password)
    server.send_message(message)
    server.quit()
# Example usage
subject = "Hello from Python!"
body = "This is an example email sent using Python."
to_email = "recipient@gmail.com"
from_email = "your@gmail.com"
password = "your_password"
send_email(subject, body, to_email, from_email, password)

JavaScript (Node.js):

const nodemailer = require('nodemailer');
async function sendEmail(subject, body, toEmail, fromEmail, password) {
    let transporter = nodemailer.createTransport({
        service: 'gmail',
        auth: {
            user: fromEmail,
            pass: password
        }
    });
    let mailOptions = {
        from: fromEmail,
        to: toEmail,
        subject: subject,
        text: body
    };
    let info = await transporter.sendMail(mailOptions);
    console.log('Message sent: %s', info.messageId);
}
// Example usage
const subject = 'Hello from JavaScript!';
const body = 'This is an example email sent using JavaScript.';
const toEmail = 'recipient@gmail.com';
const fromEmail = 'your@gmail.com';
const password = 'your_password';
sendEmail(subject, body, toEmail, fromEmail, password);

PHP:

<?php
require 'PHPMailer/PHPMailerAutoload.php';
function sendEmail($subject, $body, $toEmail, $fromEmail, $password) {
    $mail = new PHPMailer;
    $mail->isSMTP();
    $mail->SMTPAuth = true;
    $mail->SMTPSecure = 'tls';
    $mail->Host = 'smtp.gmail.com';
    $mail->Port = 587;

    $mail->Username = $fromEmail;
    $mail->Password = $password;

    $mail->setFrom($fromEmail);
    $mail->addAddress($toEmail);

    $mail->Subject = $subject;
    $mail->Body = $body;

    if (!$mail->send()) {
        echo 'Message could not be sent.';
        echo 'Mailer Error: ' . $mail->ErrorInfo;
    } else {
        echo 'Message has been sent';
    }
}
// Example usage
$subject = 'Hello from PHP!';
$body = 'This is an example email sent using PHP.';
$toEmail = 'recipient@gmail.com';
$fromEmail = 'your@gmail.com';
$password = 'your_password';
sendEmail($subject, $body, $toEmail, $fromEmail, $password);

В этих примерах используется протокол SMTP для отправки электронных писем через SMTP-сервер Gmail. Для аутентификации вам необходимо предоставить свои учетные данные Gmail (адрес электронной почты и пароль). Обязательно замените 'your@gmail.com'и 'your_password'фактическими данными вашей учетной записи Gmail.