无法从Android设备发送邮件

Question

Gmail在我的标签中被屏蔽，我也更改了主机名，但邮件未发送

public class Mail 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; 

  public Mail() { 
    _host = "host.smartpoint.in"; // default smtp server 
    _port = "110"; // default smtp port 
    _sport = "25"; // default socketfactory port 

    _user = ""; // username  
    _pass = ""; // password  
    _from = "lavanya@gmail.com"; // email sent from 
    _subject = "Sample Test "; // email subject 
    _body = "mail to test local mail .....bla bla bla..."; // 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); 

    Log.d(TAG, "mc -> "+mc);

  } 

  public Mail(String user, String pass) { 
    this(); 

    _user = user; 
    _pass = pass; 
  } 

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

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

     Log.d(TAG, " send()  -> ");
      Session session = Session.getInstance(props, this); 
      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()); 

      Log.d(TAG, " msg  -> "+msg);
      // setup message body 
      BodyPart messageBodyPart = new MimeBodyPart(); 
      messageBodyPart.setText(_body); 
      _multipart.addBodyPart(messageBodyPart); 

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

      // send email 
         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); 
  } 

  @Override 
  public PasswordAuthentication getPasswordAuthentication() { 
    return new PasswordAuthentication(_user, _pass); 
  } 

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

    props.put("host.smartpoint.in", _host); 

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

    if(_auth) { 
      props.put("mail.smtp.auth", "true"); 
    } 
    props.put("mail.smtp.starttls.enable","true");
    props.put("mail.smtp.port", _port); 
    props.put("mail.smtp.socketFactory.port", _sport); 
    props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
    props.put("mail.smtp.socketFactory.fallback", "false"); 
    props.put("mail.smtp.starttls.enable","true");


    return props; 
  } 

  // the getters and setters 
  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;
    }

  // more of the getters and setters ….. 
} 

您能告诉我该怎么做才能成功发送邮件，即使我的Wi-Fi连接已阻止gmail访问

Answer 1

如果您的网络/ wifi上的Gmail被阻止，您会发现它以某种方式被阻止：

• 主机名可能在代理上被阻止，这意味着您仍然可以通过电子邮件客户端（如Thunderbird）检索邮件。
• 弹出，IMAP和STMP端口可能会被阻止，在这种情况下，您可以尝试基于VPN的解决方案。
• 邮件相关端口上与gmails主机名的传出连接可能被阻止。