無法從Android設備

Question

的Gmail被擋在我的選項卡中發送郵件，我改變了主機名也，但郵件沒有發送

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 ….. 
} 

u能告訴我應該怎麼做才能成功地發送郵件，甚至我的WiFi連接阻止Gmail的訪問

Answer 1

如果Gmail被封鎖你的網絡/無線網絡連接，你會發現，它被阻止以某種方式：

• 主機名可以擋在了代理，這意味着你仍然能夠r etrieve通過電子郵件客戶端（如Thunderbird）發送郵件。
• Pop，IMAP & STMP端口可能會被阻止，在這種情況下，您可以嘗試基於VPN的解決方案。
• 與郵件相關端口上gmails主機名的傳出連接可能被阻止。