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Sending Email using Javamail via Exchange

I'm having some troubles sending emails via Javamail using my company exchange server. We have an application that was sending emails via the gmail server without any problems, but for some changes in the policies of Google we want to use the company server to do the job.
Im sure the problem in the session properties, but i cant find a way to make it work
Properties props = new Properties();
props.put("mail.smtp.port", 465);
props.put("mail.smtp.socketFactory.port", 465);
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");
props.put("mail.smtp.auth", "true");
props.put("mail.debug", "true");
props.put("mail.smtp.host", _server);
session = Session.getInstance(props, this);
try {
transport = session.getTransport("smtp");
transport.connect("mail.company.com",_user,_pass);
transport.close();
This is the error is showing the log
javax.mail.MessagingException: Could not connect to SMTP host: mail.company.com, port: 443;
nested exception is:
avax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.

You have to check your email provider and its SMTP settings; server, port and encryption method.
The following code snippet works with me
Put
//1) get the session object
Properties properties = new Properties();
properties.put("mail.smtp.auth", "true");
// You have missed this line.
properties.put("mail.smtp.starttls.enable", "true");
// This SMTP server works with me for all Microsoft email providers, like: -
// Outlook, Hotmail, Live, MSN, Office 365 and Exchange.
properties.put("mail.smtp.host", "smtp.live.com");
properties.put("mail.smtp.port", "587");
properties.put("mail.smtp.user", user);
properties.put("mail.smtp.pwd", password);
Session session = Session.getInstance(properties, null);
session.setDebug(true); // To trace the code implementation.
Transport transport = session.getTransport("smtp");
transport.connect("smtp.live.com", 587, user, password);
transport.close();
instead of
props.put("mail.smtp.port", 465);
props.put("mail.smtp.socketFactory.port", 465);
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.socketFactory.fallback", "false");
props.put("mail.smtp.auth", "true");
props.put("mail.debug", "true");
props.put("mail.smtp.host", _server);
session = Session.getInstance(props, this);
try {
transport = session.getTransport("smtp");
transport.connect("mail.company.com",_user,_pass);
transport.close();
I found this website so helpful, in getting other email providers SMTP settings information.

Not able to send Mail in Java through SMTP server

When I try to send mail in java from my personal email like (sp#gmail.com) it is sent successfully.
But when I am using my company email(sp#example.com) it throws Authentication failed exception. I am using TLS authentication and it is successfully connected to host.
When I am manually login on my email it will always ask for Two Step
verification. Even if I have disabled my two step verification and have also done the change to make it less secure, it still asks for two step verification as it is showing this message after putting my username and password:
2-Step Verification
Based on your organization's policy, you need to turn on 2-step verification. Contact your administrator to learn more.
Enter one of your 8-digit backup codes
In this situation what should I do? As this is my first task in this company, I would be so happy if you could help me. How I can solve this problem?
My code :
String to = "abc#example.com";
String user = "sp#example.com";
String pass = "1234";
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.example.com");
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
Session session = Session.getInstance(props,new javax.mail.Authenticator()
{
protected PasswordAuthentication getPasswordAuthentication()
{
return new PasswordAuthentication(user,pass);
}
});
session.setDebug(true);
try
{
/* Create an instance of MimeMessage,
it accept MIME types and headers
*/
MimeMessage message = new MimeMessage(session);
message.setFrom(new InternetAddress(user));
message.addRecipient(Message.RecipientType.TO,new InternetAddress(to));
message.setSubject(sub);
message.setText(msg);
/* Transport class is used to deliver the message to the recipients */
Transport.send(message);
}
catch(Exception e)
{
e.printStackTrace();
}
Error message:
535 5.7.3 Authentication unsuccessful javax.mail.AuthenticationFailedException at javax.mail.Service.connect(Service.java:319) at javax.mail.Service.connect(Service.java:169) at javax.mail.Service.connect(Service.java:118) at javax.mail.Transport.send0(Transport.java:188) at javax.mail.Transport.send(Transport.java:118) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPo‌​olExecutor.java:624) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.r‌​un(TaskThread.java:6‌​1) at java.lang.Thread.run(Thread.java:748)
SMTP configuration:
configuration:props.put("mail.smtp.host", "smtp.oceaneering.com"); props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.starttls.enable", "true");

First is need to turn on 2-Step Verification .(after that google script to give new option for creation app passwords) https://support.google.com/accounts/answer/185839?
Next you must to create the app passwords https://support.google.com/accounts/answer/185833?hl=en
Last step to replace this line in your code
String pass = "1234"; - with app specific password, (it must generate on step 2) Some like String pass = "djd5n7hsd";
And For future reader in may be useful to check network and firewall setting on your system and mail setting your ISP. To check if packet can to reach gmail server.
Try telnet command : telnet smtp.gmail.com 587

Could not connect to SMTP host: smtp8.net4india.com, port: 25;

While sent email showing error:
javax.mail.MessagingException: Could not connect to SMTP host: smtp8.net4india.com, port: 25;
nested exception is:
java.net.ConnectException: Connection timed out: connect
My email settings is:
String mailProcessed = "";
Properties props = new Properties();
props.put("mail.smtp.host", "smtp8.net4india.com");
props.put("mail.smtp.socketFactory.port", "25");
props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "25");
props.put("mail.smtp.starttls.enable", "true");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(frmMail, frmPass);
}
});

remove props.put("mail.smtp.starttls.enable", "true");
and add props.put("mail.smtp.ssl.enable", "true");
You are using SSL, not TLS.
Also make sure the mail server supports SSL.
Also make sure that the mail server is using TCP protocol SMTP, they might be using IMAP or POP3.
In that case you need to change the properties you reference by the protocol they use, i.e:
props.put("mail.pop3.socketFactory.port", "25");
props.put("mail.pop3.socketFactory.class","javax.net.ssl.SSLSocketFactory");
You are using getDefaultInstance for the session, but if a session was already established it will return the existing session and your properties will be lost.
Check the common mistakes page, it has it all:
https://javaee.github.io/javamail/FAQ#commonmistakes

Unknown SMTP host: outlook.office365.com;

I have written code in java to send mail. The issue I am facing is UnknownHostException. I am using SMTP Host as outlook.office.com as the email account from where i want to send the mail is corporate and accessed using outlook. Here is the code.
Properties props=new Properties();
props.put("mail.smtp.auth","true");
props.put("mail.smtp.starttls.enable","true");
props.put("mail.smtp.host","outlook.office365.com");
props.put("mail.smtp.port","587");
Session session=Session.getInstance(props, new Authenticator(){
protected PasswordAuthentication getPasswordAuthentication(){
return new PasswordAuthentication(sender, password);
}
});
The session object is not null as I have put a check on that. If session is getting created then what is the reason I am facing this exception?

change
props.put("mail.smtp.host","outlook.office365.com");
to
props.put("mail.smtp.host","smtp.office365.com");
or
props.put("mail.smtp.host", "m.outlook.com");
for more info, visit this and this site.

how to solve com.sun.mail.smtp.SMTPSendFailedException in java ?

I am creating a application in which i am sending mail to users.
But the problem is while i am using Transport.send(msg) method, it displays the following error:
com.sun.mail.smtp.SMTPSendFailedException: 530-5.5.1 Authentication Required.
I am using the following properties to send mail.
props.put("mail.transport.protocol", "smtp");
props.put("mail.host", smtpHostName);
props.put("mail.user", smtpUser);
props.put("mail.password", smtpPass);
props.put("mail.smtp.auth", smtpAuth == 1 ? true : false);
props.put("mail.port", smtpPort);
props.put("mail.smtp.starttls.enable", smtpTLS == 1 ? true : false);
Please help me to resolve this problem.

Try this
props.put("mail.smtp.host", host);
props.put("mail.smtp.auth", "true");
props.put("mail.debug", "false");
props.put("mail.smtp.port", port);
And while creating session use this authentication code
l_session = Session.getInstance(props,
new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(username, password);
}
});
l_session.setDebug(true);

Our environment is running under WebSphere 7. To support secured smtps, correct variant to turn on SMTPS AUTHorization is:
"mail.smtps.auth=true"
Actually, according to decompiled sources, before authorizing the mail session WebSphere checks if there is a property composed as: "mail."+ transportProtocol + ".auth" set to "true".
This helped me to send emails via gmail.