JavaMail for Android

compile 'com.sun.mail:android-mail:1.6.0'
// compile 'com.sun.mail:android-activation:1.6.0'

public static void javaMailSendSimpleEmail() throws Exception {
        // 收件人电子邮箱
        String to = "*@qq.com";

        // 发件人电子邮箱
        String from = "*@163.com";

        // 获取系统属性
        Properties properties = new Properties();

        // 设置邮件服务器
        properties.setProperty("mail.transport.protocol", "SMTP");
        properties.setProperty("mail.smtp.host", "smtp.163.com");
        properties.setProperty("mail.smtp.port", "25");
        properties.setProperty("mail.smtp.auth", "true");
        properties.setProperty("mail.smtp.timeout", "1000");

        // 获取默认session对象
        Session session = Session.getDefaultInstance(properties,
                new Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        // 登陆邮件发送服务器的用户名和密码
                        return new PasswordAuthentication("*@163.com", "***");
                    }
                });

       // 创建默认的 MimeMessage 对象
        MimeMessage message = new MimeMessage(session);

        // Set From: 头部头字段
        message.setFrom(new InternetAddress(from));

        // Set To: 头部头字段
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

        // Set Subject: 头部头字段
        message.setSubject("邮件标题");

        // 设置消息体
        message.setText("邮件内容");

        // 发送消息
        Transport.send(message);
    }

发送带复件的邮件

public static void sendEmail(File file) throws Exception {
        // 收件人电子邮箱
        String to = "*@qq.com";

        // 发件人电子邮箱
        String from = "*@163.com";

        // 获取系统属性
        Properties properties = new Properties();
        // 设置邮件服务器
        properties.setProperty("mail.transport.protocol", "smtp");
        properties.setProperty("mail.smtp.host", "smtp.163.com");
        properties.setProperty("mail.smtp.port", "25");
        properties.setProperty("mail.smtp.auth", "true");
        properties.setProperty("mail.smtp.timeout", "1000");
        properties.put("mail.debug", true);

        // 获取默认session对象
        Session session = Session.getDefaultInstance(properties,
                new Authenticator() {
                    protected PasswordAuthentication getPasswordAuthentication() {
                        // 登陆邮件发送服务器的用户名和密码
                        return new PasswordAuthentication(
                                "*", "*");
                    }
                });

        MimeBodyPart text = new MimeBodyPart();
        text.setContent("<h4>你猜我在做什么呢?</h4>", "text/html;charset=UTF-8");

        //创建邮件附件
        MimeBodyPart attach = new MimeBodyPart();
        DataHandler dh = new DataHandler(new FileDataSource(file));
        attach.setDataHandler(dh);
        attach.setFileName(dh.getName());

        // 创建默认的 MimeMessage 对象
        MimeMessage message = new MimeMessage(session);

        // Set From: 头部头字段
        InternetAddress address = new InternetAddress(from);
        message.setFrom(address);
        message.addRecipient(Message.RecipientType.CC, address);

        // Set To: 头部头字段
        message.addRecipient(Message.RecipientType.TO, new InternetAddress(to));

        //创建容器描述数据关系
        MimeMultipart mp = new MimeMultipart();
        mp.addBodyPart(text);
        mp.addBodyPart(attach);
        mp.setSubType("mixed");

        message.setSubject("做什么.");
        message.setContent(mp);
        message.saveChanges();

        Transport transport = session.getTransport();
        transport.connect();
        transport.sendMessage(message, message.getAllRecipients());
        transport.close();
    }

防坑:

• 以HTML形式发送text, 防止被当成垃圾文件.

MimeBodyPart text = new MimeBodyPart();
text.setContent("<h4>你猜我在做什么呢?</h4>", "text/html;charset=UTF-8");

• 添加抄送 降低163 [554 DT:SPM]错误

// 添加抄送
InternetAddress address = new InternetAddress(from);
message.setFrom(address);
message.addRecipient(Message.RecipientType.CC, address);

// 不使用 Transport.send(message);
Transport transport = session.getTransport();
transport.connect();
transport.sendMessage(message, message.getAllRecipients());
transport.close();

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参考文章

[1]路易斯睿齐·Android 使用 JavaMail 发送邮件 实践总结
[2]Oracle·JavaMail[M]