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我的 android 应用程序使用该JavaMail库发送带有附件的电子邮件。通过Wifi应用程序工作得很好，但是当我断开连接WiFi并打开时3G，邮件无法发送。似乎我无法联系到邮件服务器，即使邮件服务器在互联网上是公共的，而不是在网络上本地。

当我连接到 3G 时，SMTP 端口会改变吗？如果是这样，那就很奇怪了。发送邮件的代码片段如下

package Logic;

public class SendMail extends javax.mail.Authenticator {

    private String _user;
    private String _pass;

    private String[] _to;
    private String _from;

    private String _port;
    private String _sport;

    private String _host;

    private String _subject;
    private String _body;

    private boolean _auth;

    private boolean _debuggable;

    private Multipart _multipart;
    SharedPreferences sharedPrefs;

    public SendMail() {

        _user = ""; // username
        _pass = ""; // password
        _from = ""; // email sent from
        _subject = ""; // email subject
        _body = ""; // email body

        _debuggable = false; // debug mode on or off - default off
        _auth = true; // smtp authentication - default on

        _multipart = new MimeMultipart();

        // There is something wrong with MailCap, javamail can not find a
        // handler for the multipart/mixed part, so this bit needs to be added.
        MailcapCommandMap mc = (MailcapCommandMap) CommandMap
                .getDefaultCommandMap();
        mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");
        mc.addMailcap("text/xml;; x-java-content-handler=com.sun.mail.handlers.text_xml");
        mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");
        mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed");
        mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");
        CommandMap.setDefaultCommandMap(mc);



    }

    public SendMail(Context c) {
        this();

        sharedPrefs = PreferenceManager.getDefaultSharedPreferences(c);
        _host = sharedPrefs.getString("host", null);
        _port = sharedPrefs.getString("port", null);
        _sport = sharedPrefs.getString("port", null); 
        _user = sharedPrefs.getString("mail", null);
        _pass = sharedPrefs.getString("pw", null); 

    }

    public boolean send() throws Exception {
        Properties props = _setProperties();

        if (!_user.equals("") && !_pass.equals("") && _to.length > 0
                && !_from.equals("") && !_subject.equals("")
                && !_body.equals("")) {

            Session session = Session.getInstance(props,
                    new GMailAuthenticator(_user, _pass));

            MimeMessage msg = new MimeMessage(session);


            msg.setFrom(new InternetAddress(_from));

            InternetAddress[] addressTo = new InternetAddress[_to.length];
            for (int i = 0; i < _to.length; i++) {
                addressTo[i] = new InternetAddress(_to[i]);
            }
            msg.setRecipients(MimeMessage.RecipientType.TO, addressTo);

            msg.setSubject(_subject);
            msg.setSentDate(new Date());

            // setup message body
            BodyPart messageBodyPart = new MimeBodyPart();
            messageBodyPart.setText(_body);
            _multipart.addBodyPart(messageBodyPart);


            // Put parts in message
            msg.setContent(_multipart);

            // send email, henger noe her?!
            Transport.send(msg);

            return true;
        } else {
            return false;
        }
    }

    public void addAttachment(String filename) throws Exception {
        BodyPart messageBodyPart = new MimeBodyPart();
        DataSource source = new FileDataSource(filename);
        messageBodyPart.setDataHandler(new DataHandler(source));
        messageBodyPart.setFileName(filename);


        _multipart.addBodyPart(messageBodyPart);
    }

    class GMailAuthenticator extends Authenticator {
        String user;
        String pw;

        public GMailAuthenticator(String username, String password) {
            super();
            this.user = username;
            this.pw = password;
        }

        public PasswordAuthentication getPasswordAuthentication() {
            return new PasswordAuthentication(user, pw);
        }
    }

    private Properties _setProperties() {
        Properties props = new Properties();

        props.put("mail.smtp.host", _host);
        props.put("mail.smtp.starttls.enable", "true");

        if (_debuggable) {
            props.put("mail.debug", "true");
        }

        if (_auth) {
            props.put("mail.smtp.auth", "true");
        }

        props.put("mail.smtp.port", _port);
        props.put("mail.smtp.socketFactory.port", _sport);
        props.put("mail.smtp.socketFactory.fallback", "true");

        return props;
    }

    public String getBody() {
        return _body;
    }

    public void setBody(String _body) {
        this._body = _body;
    }

    public void setTo(String[] toArr) {
        this._to = toArr;
    }

    public void setFrom(String string) {
        this._from = string;
    }

    public void setSubject(String string) {
        this._subject = string;
    }
}

是的，我在清单中指定了正确的权限

<uses-permission android:name="android.permission.INTERNET"/>
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1 回答 1

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一些 ISP 限制 SMTP 服务器的使用，并强制您使用他们的 SMTP 服务器而不是您自己的服务器。
因此，您将pop.yourmailserver.com使用smtp.yourisp.com.

或者，他们禁止您使用 3G 的 SMTP 发送邮件。

于 2012-08-28T12:14:08.703 回答