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Mail API stopped to work

I have an automated java mail application that sends automated mail to users when some important update occur in our database. It was working fine. However it started to give me errors and I realized that it's not working.
The error says:
"Please log in via your web browser and then try again.
Learn more at https://support.google.com/mail/bin/answer.py?answer=78754 l10sm7526045oev.7 - gsmtp"
The java mail application that I write is huge and contains some confidential values(password etc.), I decided to write a sample demo to show you what's going on. It gives me the same error. Please assume that javax.MAIL API has been imported to the project. Here is what I have:
public class MailDemo {
public static void main(String[] args) {
final String userName = "dummyEmail#gmail.com";
final String password = "dummyPassword";
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", "smtp.gmail.com");//Smtp server address
props.put("mail.smtp.port", "587");//port for the smtp server
Session session = Session.getInstance(props, new Authenticator(){
protected PasswordAuthentication getPasswordAuthentication(){
return new PasswordAuthentication(userName, password);
}
});
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("dummyEmail#gmail.com"));//from email address
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("dummyEmail#gmail.com"));//to email address
message.setSubject("My first Email");//Subject of the mail
message.setContent("<h1>This is a test email</h1>", "text/html; charset=utf-8");//Content of the mail
Transport.send(message);//send the message
System.out.println("Email Stiation:Done!");
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}

Well, i found the problem. Actually the codes are correct. It's gmail. it blocks the sign in attempts.I think that gmail thinks the attempts are not real.

Javamail rate for the client exceeded

I need to send at least 200 messages from a stretch. When the program starts, send mail successfully to 15 or 17, then I get this error:
MESSAGE ERROR:
com.sun.mail.smtp.SMTPSendFailedException: 421 4.4.2 Message submission rate for this client has exceeded the configured limit
What I can do?
CODE JAVA
public void mandarEmail(String correos, String mensaje, String asunto) {
Message message;
Properties props = new Properties();
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.transport.protocol", "smtp");
props.setProperty("mail.smtp.port", "587");
props.put("mail.smtp.host", "pod51004.outlook.com");
props.put("mail.smtp.debug", "true");
Session session = Session.getInstance(props, new javax.mail.Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("docemail#usmp.pe", "docpass");
}
});
try {
message = new MimeMessage(session);
message.setFrom(new InternetAddress("USMP - FN <documentos-fn#usmp.pe>"));
message.setSubject(asunto);
message.addRecipients(Message.RecipientType.TO, InternetAddress.parse(correos));
message.addRecipients(Message.RecipientType.BCC, new InternetAddress[]{new InternetAddress("ivan_pro_nice#hotmail.com")});
message.setContent(mensaje, "text/html; charset=utf-8");
Transport transport = session.getTransport("smtp");
transport.connect("docemail#usmp.pe", "docpass");
transport.sendMessage(message, message.getAllRecipients());
transport.close();
} catch (MessagingException e) {
throw new RuntimeException(e);
} finally {
props = null;
message = null;
}
}

That's the server you're connecting to, and not a client issue. Here's a doc on how to parse SMTP codes from the server.
A mail server will reply to every request a client (such as your email
program) makes with a return code. This code consists of three
numbers.
In your case, you're getting 421.

You probably need to pay for a "business" account from your mail server vendor so they'll let you send more email.

if you want to send single email to 200 clients. Than u can add an array of reciever's email addresses of size upto 50.
but i you want to send different msg for each email. Then you can create a new connection to email server with a counter that counts send emails as well as it counts 15 it should create a new connection.
to test your code use mailtrap.io

javax.mail.SendFailedException: Invalid Addresses (While trying to send emal using Rediffmail)

This program attempts to send email by first connecting to smtp.rediffmail.com . There is no compile time error or compile time exception.But as i try to run the following program it generates the following exception.
javax.mail.SendFailedException: Invalid Addresses;
nested exception is:
com.sun.mail.smtp.SMTPAddressFailedException: 421 Authorization failed: please authenticate by
doing get message first
I can't figure out what the exception is and why i am getting this exception .
Here is the complete program.In this i have tried to make TLS connection with rediffmail server.
import javax.mail.Authenticator;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Properties;
class rediff {
public static void main(String args[]) {
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.rediffmail.com");
props.put("mail.stmp.user", "from");
//To use TLS
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.password", "password");
Session session = Session.getDefaultInstance(props, new Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
String username = "from";
String password = "password";
return new PasswordAuthentication("from", "password");
}
});
String to = "me#gmail.com";
String from = "from#rediff.com";
String subject = "Testing...";
MimeMessage msg = new MimeMessage(session);
try {
msg.setFrom(new InternetAddress(from));
msg.setRecipient(MimeMessage.RecipientType.TO, new InternetAddress(to));
msg.setSubject(subject);
msg.setText("rediff program working...!");
Transport transport = session.getTransport("smtp");
transport.send(msg);
System.out.println("fine!!");
} catch(Exception exc) {
System.out.println(exc);
}
}
}
Why do i get this exception ?

as per: http://www.techtalkz.com/microsoft-outlook/193842-pop3.html
In your account settings, enable the "Log on to incoming server before
sending mail" on the "Outgoing Server" tab of your account properties. How
to locate these properties and tabs is Outlook version-specific but you
decided that information wasn't important.
The error is specific to the SMTP service you are trying to use from your client. It's not a code problem. Check your rediffmail.com account settings

The problem with the code is this:
Transport transport = session.getTransport("smtp");
transport.send(msg);
the send method is a static method and you are not suppose to access it with an instance of Transport class. it should be - Transport.send(msg);

You're trying to use TLS auth but I don't see any port settings in your code. Usually smtp server uses different ports for TLS/SSL authentication, try setting it via mail.smtp.socketFactory.port. For TLS default value is 587, for SSL - 993 as far as I remember.
props.put("mail.smtp.socketFactory.port", port);
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");

I don't get the e-mail using this code. What is the problem?

The following is the program, which I am trying to send e-mail. The code is error free and I don't get any run time exception. But the code is unable to send e-mail. I have revised this code a lot but can't get what is actually wrong.
The sender and the receiver both have GMail accounts. The sender has 2-step verification process disabled. (I don't think it matters for the receiver. Does it?)
The code :
import javax.mail.*;
import javax.mail.internet.*;
import java.util.*;
class tester {
public static void main(String args[]) {
Properties props = new Properties();
props.put("mail.smtp.host" , "smtp.gmail.com");
props.put("mail.stmp.user" , "username"); // username or complete address ! Have tried both
Session session = Session.getDefaultInstance( props , null);
String to = "me#gmail.com";
String from = "from#gmail.com";
String subject = "Testing...";
Message msg = new MimeMessage(session);
try {
msg.setFrom(new InternetAddress(from));
msg.setRecipient(Message.RecipientType.TO , new InternetAddress(to));
msg.setSubject(subject);
msg.setText("Working fine..!");
System.out.println("fine!!??");
} catch(Exception exc) {
System.out.println(exc);
}
}
}

Well, your code doesn't actually attempt to send the message. Take a look at Transport.send.
Here are some examples:
http://www.javapractices.com/topic/TopicAction.do?Id=144
http://www.vipan.com/htdocs/javamail.html

First of all, you forgot to call Transport.send() to send your MimeMessage.
Secondly, GMail needs to be configured to use TLS or SSL connection. The following needs to be added to your Properties (props):
//To use TLS
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
//To use SSL
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
To connect to GMail SMTP, use the Transport.connect() method. I see you are not using any Transport at all in your code, so add this:
Transport transport = session.getTransport();
//Connect to GMail
transport.connect("smtp.gmail.com", 465, "USERNAME_HERE", "PASSWORD_HERE");
transport.send(msg);
Alternatively, you can create a Session by including a javax.mail.Authenticator as a parameter.
Example:
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("USERNAME_HERE", "PASSWORD_HERE");
}
});
I hope this helps you.
Resources:
Send email with SMTPS (eg. Google GMail) (Javamail)
JavaMail API – Sending email via Gmail SMTP example

Sending email from a java stateless EJB (Java EE-6)

I want to send an email ussing an EJB but i the only thing i get in return in this exception:
java.lang.RuntimeException: javax.mail.AuthenticationFailedException: failed to connect, no password specified?
This is how my EJB looks like:
#Stateless(name = "ejbs/EmailServiceEJB")
public class EmailServiceEJB extends Authenticator implements IEmailServiceEJB {
public PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("xxxxxxx#gmail.com",
"xxxxxxx");
}
public void sendAccountActivationLinkToBuyer(String destinationEmail,
String name) {
// OUR EMAIL SETTINGS
String host = "smtp.gmail.com";// Gmail
int port = 465;
String serviceUsername = "xxxxxxx#gmail.com";
String servicePassword = "xxxxxxx";// Our Gmail password
Properties props = new Properties();
props.put("mail.smtp.user", serviceUsername);
props.put("mail.smtp.host", host);
props.put("mail.smtp.port", port);
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.debug", "true");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.socketFactory.port", port);
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");
// Destination of the email
String to = destinationEmail;
String from = "xxxxxxx#gmail.com";
// Creating a javax.Session with the our properties
Session session = Session.getInstance(props);
try {
Message message = new MimeMessage(session);
// From: is our service
message.setFrom(new InternetAddress(from));
// To: destination given
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse(to));
message.setSubject("Comfirm your account");
// Instead of simple text, a .html template should be added here!
message.setText("Welcome....... ");
Transport transport = session.getTransport("smtp");
transport.connect(host, port, serviceUsername, servicePassword);
Transport.send(message, message.getAllRecipients());
transport.close();
} catch (MessagingException e) {
throw new RuntimeException(e);
}
}
}
I dont know why it keeps saying that the password is not specified? Does the SSLSocketFactory have something to do with it? Do i need to call the getPasswordAuthenticion() method somewhere, or calling the second method from my managed bean is all i need?

I don't know why your code isn't working, but you might want to take a look at this:
http://spitballer.blogspot.com/2010/02/sending-email-via-glassfish-v3.html
It shows an alternate method of configuring email in Java EE, which I think works much better. The connection details are configured at the container level, just like a container-managed database connection.

Read up on SPF and DKIM.
It's hard to know what's going wrong here, as your code is only 1/2 the needed information. The real issue is probably that your code doesn't fit your environment, and SPF and DKIM often is a reason that connecting to any public SMTP server and sending an email doesn't work.
At least after reading a little about SPF and DKIM, you'll be able to know if it is an issue in your case, or if it is not an issue in your case.