Conrad Conrad -4 years ago 133
Android Question

SSLException in using JavaMail API

I am making use of Java Mail API to develop an app to send mail. I can successfully send the mail if I use the mail server hosting by yahoo or gmail. However, when I try to use my own mail server, I am fail to send the mail, what are the possible reasons causing the failure? When I execute my app in my device, it displays "Email was not sent", so no exception occurs. May I ask how can I change my program so I can successfully connect my app to my smtp server, or how can I get more information to display therefore I can understand why the connection has failed.

Here is my program:
Sender.java

public class Sender extends Activity {

Button Send;
TextView text;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sender);

Send = (Button) findViewById(R.id.mail);
text = (TextView) findViewById(R.id.textView1);

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
.permitAll().build();
StrictMode.setThreadPolicy(policy);

Send.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new SendMail().execute();
}
});

}

private class SendMail extends AsyncTask<String, Void, Integer>
{
ProgressDialog pd = null;
String error = null;
Integer result;

@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
pd = new ProgressDialog(Sender.this);
pd.setTitle("Sending Mail");
pd.setMessage("Please wait...");
pd.setCancelable(false);
pd.show();
}

@Override
protected Integer doInBackground(String... params) {
// TODO Auto-generated method stub

MailSender sender = new MailSender("me@mysmtp.com", "password");

sender.setTo(new String[]{"you@mysmtp.com", "me@gmail.com"});
sender.setFrom("me@mysmtp.com");
sender.setSubject("Test mail");
sender.setBody("This is the mail body");
try {
if(sender.send()) {
System.out.println("Message sent");
return 1;
} else {
return 2;
}
} catch (Exception e) {
error = e.getMessage();
Log.e("SendMail", e.getMessage(), e);
}
return 3;
}

protected void onPostExecute(Integer result) {
pd.dismiss();
if(error!=null) {
text.setText(error);
}
if(result==1) {
Toast.makeText(Sender.this,
"Email was sent successfully.", Toast.LENGTH_LONG)
.show();
} else if(result==2) {
Toast.makeText(Sender.this,
"Email was not sent.", Toast.LENGTH_LONG).show();
} else if(result==3) {
Toast.makeText(Sender.this,
"There was a problem sending the email.",
Toast.LENGTH_LONG).show();
}
}
}
}


MailSender.java

public class MailSender extends Authenticator {
private String user;
private String password;

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 multi;

public MailSender(){
host = "web.mysmtp.com";
port = "25";
sport = "25";

user = "";
password = "";
from = "";
subject = "";
body = "";

debuggable = false;
auth = true;

multi = 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/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 MailSender(String user, String password){
this();
this.user = user;
this.password = password;
}

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

try{
Session session = Session.getInstance(props, this);
session.setDebug(true);

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());

BodyPart messageBodyPart = new MimeBodyPart();
messageBodyPart.setText(body);
multi.addBodyPart(messageBodyPart);

msg.setContent(multi);

Transport transport = session.getTransport("smtps");
transport.connect(host, 25, user, password);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();
return true;
} catch (Exception e) {
e.printStackTrace();
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);

multi.addBodyPart(messageBodyPart);
}

@Override
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(user, password);
}

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

props.put("mail.smtp.host", host);

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.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");

return props;
}

public void setTo(String[] toAddress) {
this.to = toAddress;
}

public void setFrom(String fromAddress) {
this.from = fromAddress;
}

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

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


Error messages in error log:

08-15 11:21:37.284: W/System.err(2553): javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x5c075548: Failure in SSL library, usually a protocol error
08-15 11:21:37.291: W/System.err(2553): Caused by: javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x5c075548: Failure in SSL library, usually a protocol error
08-15 11:21:37.299: W/System.err(2553): Caused by: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x5c075548: Failure in SSL library, usually a protocol error

Answer Source

You're connecting to port 25 and using SSL. Port 25 is the non-SSL (plain text) port. Assuming your server is set up for SSL, use the connect method that doesn't require you to specify a port number and let JavaMail use the default port.

Recommended from our users: Dynamic Network Monitoring from WhatsUp Gold from IPSwitch. Free Download