Unable to send mails using smtp server-javamail

Unable to send mails using smtp server-javamail - java

I have been trying to send an email using an smtp server through javamail api. I get the following error:
javax.mail.MessagingException: Could not connect to SMTP host: smtp.host.com, port: 587;
nested exception is:java.net.SocketException: Permission denied: connect
Here's how I create the Properties and Session object for the mail:
private Session getSession() {
Authenticator authenticator = new Authenticator();
Properties properties = System.getProperties();
properties.setProperty("mail.smtp.submitter", authenticator.getPasswordAuthentication().getUserName());
properties.setProperty("mail.smtp.auth", "false");
properties.setProperty("mail.smtp.starttls.enable", "false");
properties.setProperty("mail.smtp.host", "smtp.hostname.com");
properties.setProperty("mail.smtp.port", "587");
properties.setProperty("mail.smtp.ssl.trust", "smtp.hostname.com");
properties.setProperty("java.net.preferIPv4Stack" , "true");
return Session.getInstance(properties, authenticator);
}
private class Authenticator extends javax.mail.Authenticator {
private PasswordAuthentication authentication;
public Authenticator() {
String username = "username";
String password = "password";
authentication = new PasswordAuthentication(username, password);
}
protected PasswordAuthentication getPasswordAuthentication() {
return authentication;
}
}
I have tried disabling the authentication as suggested by some posts and also put in resolutions for IPv4 preference according to this post:
JavaMail API to iMail -- java.net.SocketException: Permission denied: connect
but I still get the same error. Is there any other way this issue might be resolved?
Thanks.

I found a similar problem here.
Try to see if the problem is relate to an anti virus or a firewall blocking your requests.

Switch off you firewall and find in Google some security certificate that missed in you jar/lib/security
I have already faced this then I have to make use phpmailer lib in php and make on API use anywhere in your code so you can try php.

Related

How to access to a shared mail box using Oauth2 with Java (javax.mail)

I'm trying to access a shared mailbox using an Oauth2 and IMAP Protocol, but I have an error saying that the authentification have failed:
Exception in component tJava_1 (Extract_Mails)
javax.mail.AuthenticationFailedException: AUTHENTICATE failed.
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:732)
at javax.mail.Service.connect(Service.java:366)
at routines.TalendMail.mailProcess(TalendMail.java:76)
at interfaces.extract_mails_0_1.Extract_Mails.tJava_1Process(Extract_Mails.java:4843)
at interfaces.extract_mails_0_1.Extract_Mails.tLibraryLoad_1Process(Extract_Mails.java:5033)
... 3 more
I'm trying to connect with an object Store:
final Store store = session.getStore("imaps");
store.connect(serveur, 993, "user#outlook.com/shared_mail_box", accessToken);
And setting an object Propreties:
Properties props = new Properties();
props.put("mail.imap.ssl.enable", "true");
props.put("mail.imaps.sasl.enable", "true");
props.put("mail.imaps.sasl.mechanisms", "XOAUTH2");
props.put("mail.imap.auth.login.disable", "true");
props.put("mail.imap.auth.plain.disable", "true");
props.put("mail.debug", "false");
props.put("mail.debug.auth", "false");
System.setProperty("mail.mime.multipart.ignoreexistingboundaryparameter", "true");
System.setProperty("mail.mime.multipart.allowempty", "true");
props.setProperty("mail.imaps.auth.ntlm.disable", "true");
Note : I have successfuly connected to my user mailbox (user#outlook.com) after that I get an access token. But now, I have an issue with trying to connect to my shared mailbox.
Any ideas of how we can access a shared mailbox when it come to an Oauth2 protocol?

Getting this error while trying to send mail using smtp server from java! how to solve this

So i am trying to send a pdf through mail using Gmail smtp port 465 but it keeps on throwing this error,
googled it but couldn't solve this.
i don't understand whats wrong? help me on this?
thanks in advance
tried:
1.changing ports
2.tried to correct something on certificates didn't work
error:
Exception in thread "main" java.lang.RuntimeException: javax.mail.MessagingException: Exception reading response;
nested exception is:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.sample.pdf.PDFMailing.pdfMail(PDFMailing.java:72)
at com.sample.pdf.GeneratePdf.addDataToPdf(GeneratePdf.java:42)
at com.sample.pdf.Report.main(Report.java:47)
PDFMailing.java
public static void pdfMail(String file){
//Sender email-ID and Password.
final String senderEmail="xxxxxx";//Sender Mail ID
final String password="xxxxx";//Sender Mail ID Password.
//setting the Properties.
Properties props=new Properties();
props.put("mail.smtp.host", "smtp.gmail.com"); //SMTP Host
props.put("mail.smtp.socketFactory.port", "465"); //SSL Port
props.put("mail.smtp.socketFactory.class",
"javax.net.ssl.SSLSocketFactory"); //SSL Factory Class
props.put("mail.smtp.auth", "true"); //Enabling SMTP Authentication
props.put("mail.smtp.port", "465"); //SMTP Port
//Authenticating the mailID of the sender.
Authenticator auth = new Authenticator() {
//override the getPasswordAuthentication method
protected javax.mail.PasswordAuthentication getPasswordAuthentication() {
return new javax.mail.PasswordAuthentication(senderEmail, password);
}
};
//Creating and getting the Session Object.
Session session=Session.getInstance(props, auth);
//Setting the From, To, Subject, MessageBody.
try{
Message message=new MimeMessage(session);
message.setFrom(new InternetAddress(senderEmail));//Sender Mail ID
message.setRecipients(Message.RecipientType.TO,InternetAddress.parse("harshapirate#gmail.com"));//Receiver Mail ID
message.setSubject("Sample ECO PDF file");
message.setText("This a Sample ECO PDF file.");
MimeBodyPart bodyPart=new MimeBodyPart();
Multipart multipart=new MimeMultipart();
bodyPart.setText("This is multipart Text.");
//Attachments for any file.
MimeBodyPart pdfAttachment=new MimeBodyPart();
pdfAttachment.attachFile(file);
//Attach the Body part to the Multipart.
multipart.addBodyPart(bodyPart);
multipart.addBodyPart(pdfAttachment);
//Associate multipart to the message.
message.setContent(multipart);
System.out.println("Sending mail is in process.......");
//sending the message to-address mail.
Transport.send(message);
System.out.println("Mail has been sent sucessfully.");
}
catch(Exception e){
throw new RuntimeException(e);
}
}

I presume that is Java 8.0.251. Since you have the latest Java 8 release then this should not be happening:
The root certificates in a 8.0.251 keystore should all be current.
The real smtp.google.com should be using well-known root certificates.
The real smtp.google.com would not be presenting the cert chain in the wrong order.
So I think that something is else "getting in the way". Likely explanations include:
Something that is sending outgoing email connections through an SMTP proxy; e.g. a firewall or anti-virus product.
You are running on an application server that has overridden the set of trusted certificates provided by the JDK.
It is also possible that something has subverted your DNS or IP routing and you are talking to a spoofed "smtp.gmail.com" server.

Check the following:
Check if latest JDK is installed (Command: java -version) so that it has latest
certificates and updated CA's.
Check if there are multiple JDKs or JREs installed: If so remove them.
Check if JAVA_HOME is pointing to the latest JDK you installed.
(Command: echo $JAVA_HOME in linux Or echo %JAVA_HOME% in Windows command prompt)
Check if your system date and time are correct.
If above is verified then your Java installation is fine.
Code:
I see a missing property in your code: props.put("mail.smtp.starttls.enable", "true").
Add it and try.
Hope you are able to access Gmail from your browser at least. This confirms that your machine is able to access Gmail servers - Though not an exact test for SMTP, but it is still good to test.
If you are running inside Tomcat, then ensure you have the latest version and hope it has its certificate store not customized or altered in some way.
If everything above is OK, then either you are behind some proxy or you are hacked.

Maybe check for a system property or other way that someone has defined a different trust store e.g. with: -Djavax.net.ssl.trustStore=somefilename.jks
See: https://www.baeldung.com/java-keystore-truststore-difference
But the default truststore should be $JAVA_HOME/jre/lib/security/cacerts (but its contents vary between the Oracle JDK and OpenJDK - this was later fixed, see: https://openjdk.java.net/jeps/319 )
Inspecting/modifying the contents of the store can be done with the command line tool: keytool or a GUI like: https://keystore-explorer.org/
Before you go crazy try starting your application with the following extra System Property for java (-Dsystempropertyname=value):
-Djavax.net.debug=all
Then you will exactly see all details of the used trust store and offered certificates from the server, details of the SSL/TLS handshake and even all data encrypted/decrypted.
For all the information there is on this subject see the JSSE Reference Guide for your Java version, e.g.: https://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/JSSERefGuide.html

The same kind of code, I have written earlier and is in working state. Could you please give a try on using this code below:
Also, check the proper version of Java installed 8+ in your system, with all the Environment variables properly set and required for your project. If any proxy settings exists in your system, try to remove it and then again running the code.
//this will work only for gmail.
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import com.[MyProjectRelatedImports].pojo.EmployeeDetails;
public class SendEmail {
public static void sendMail(List<EmployeeDetails> emplDetails) {
Address[] to = new Address[emplDetails.size()];
try {
for (int i = 0; i < to.length; i++) {
to[i] = new InternetAddress(emplDetails.get(i).getEmail());
}
} catch (MessagingException e) {
e.printStackTrace();
}
// Recipient's email ID needs to be mentioned.
String tom = "xyz#gmail.com";// address of recipient
// Sender's email ID needs to be mentioned
String from = "abc#gmail.com"; //address of sender
// Assuming you are sending email from localhost
String host = "smtp.gmail.com";
// Get system properties
Properties properties = System.getProperties();
// Setup mail server
properties.setProperty("mail.smtp.host", host);
properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.smtp.host", host);
properties.put("mail.smtp.user", "emailID"); // User name
properties.put("mail.smtp.password", "password"); // password
properties.put("mail.smtp.port", "587");// default mail submission port
properties.put("mail.smtp.auth", "true");
// Get the default Session object.
Session session = Session.getDefaultInstance(properties, new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("emailID", "password"); // username will be your email address and password same as your Gmail account.
// And if your account is protected with 2 step verification then you need to generate the app password from the link provided
//https://security.google.com/settings/security/apppasswords
}
});
try {
// Create a default MimeMessage object.
MimeMessage message = new MimeMessage(session);
// Set From: header field of the header.
message.setFrom(new InternetAddress(from));
// Set To: header field of the header. //message.addRecipient(Message.RecipientType.TO, new InternetAddress(tom));
//Send Email to multiple recipients
message.addRecipients(Message.RecipientType.TO, to);
// Set Subject: header field
message.setSubject("Subject text via Java Class");
// Now set the actual message
message.setText("Message Content should be written here!!! Regards: Pratishtha Sharma ");
// Send message
Transport.send(message);
System.out.println("Sent message successfully....");
} catch (MessagingException mEx){
mEx.printStackTrace();}
}
}

SMTP Password with special characters - utf8 - java mail - encoding issue?

I'm trying to send an email via java.mail SMTP. I have 2 mail accounts using the same provider and settings:
using a short password with no special characters
using a long password with special characters (* > / % !)
The first one works. The second one says 535 Authentication credentials invalid.
I'm using java.mail 1.5.
Here's my code:
Properties props = new Properties();
props.put("mail.smtps.auth", "true");
props.put("mail.smtp.starttls.enable", "true");
props.put("mail.smtp.host", "smtp.1und1.de");
props.put("mail.smtp.port", "465");
Session session = Session.getInstance(props, new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("foo#example.org", "$§$&/&%§$!><>");
}
});
Transport transport = session.getTransport("smtps");
transport.connect("smtp.1und1.de", username, password);
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("foo#example.org"));
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse("bar#example.org"));
message.setSubject("subject");
message.setText("text");
transport.sendMessage(message, message.getAllRecipients());
Do I need to encode the password somehow?
Thanks in advance.
EDIT:
I now tried to login via telnet. Same problem. So this isn't related to Java, but it may be some common SMTP issue.
Using the E-Mail account using Apple Mail on Mac and iPhone works without any issues.

If you have non-ASCII special characters, you'll need to use JavaMail 1.6 and set the mail.mime.allowutf8 Session property. And the server needs to support the SMTPUTF8 extension.

Solve error javax.mail.AuthenticationFailedException

I'm not familiar with this function to send mail in java. I'm getting an error while sending email to reset a password. Hope you can give me a solution.
Below is my code:
public synchronized static boolean sendMailAdvance(String emailTo, String subject, String body)
{
String host = AppConfigManager.getProperty("SENDER-EMAIL-SMTP-ADDRESS");
String userName = AppConfigManager.getProperty("SENDER-EMAIL-SMTP-USERNAME");
String password = AppConfigManager.getProperty("SENDER-EMAIL-SMTP-PASSWORD");
String port = AppConfigManager.getProperty("SENDER-EMAIL-SMTP-PORT");
String starttls = AppConfigManager.getProperty("SENDER-EMAIL-SMTP-STARTTLS");
String socketFactoryClass = AppConfigManager.getProperty("SENDER-EMAIL-SMTP-SOCKET-CLASS");
String fallback = AppConfigManager.getProperty("SENDER-EMAIL-SMTP-ALLOW-FALLBACK");
try
{
java.util.Properties props = null;
props = System.getProperties();
props.put("mail.smtp.user", userName);
props.put("mail.smtp.host", host);
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.debug", "true");
if(!"".equals(port))
{
props.put("mail.smtp.port", port);
props.put("mail.smtp.socketFactory.port", port);
}
if(!"".equals(starttls))
props.put("mail.smtp.starttls.enable",starttls);
if(!"".equals(socketFactoryClass))
props.put("mail.smtp.socketFactory.class",socketFactoryClass);
if(!"".equals(fallback))
props.put("mail.smtp.socketFactory.fallback", fallback);
Session session = Session.getDefaultInstance(props, null);
session.setDebug(true);
MimeMessage msg = new MimeMessage(session);
msg.setFrom(new InternetAddress(userName));
msg.setSubject(subject);
msg.setText(body, "ISO-8859-1");
msg.setSentDate(new Date());
msg.setHeader("content-Type", "text/html;charset=\"ISO-8859-1\"");
msg.addRecipient(Message.RecipientType.TO, new InternetAddress(emailTo));
msg.saveChanges();
Transport transport = session.getTransport("smtp");
transport.connect(host, userName, password);
transport.sendMessage(msg, msg.getAllRecipients());
transport.close();
return true;
}
catch (Exception mex)
{
mex.printStackTrace();
return false;
}
}
Throws the following error:
DEBUG: setDebug: JavaMail version 1.4.1ea-SNAPSHOT
DEBUG: getProvider() returning javax.mail.Provider[TRANSPORT,smtp,com.sun.mail.smtp.SMTPTransport,Sun Microsystems, Inc]
DEBUG SMTP: useEhlo true, useAuth true
DEBUG SMTP: trying to connect to host "smtp.gmail.com", port 465, isSSL false 220 mx.google.com ESMTP m4sm5929870pbg.38 - gsmtp
DEBUG SMTP: connected to host "smtp.gmail.com", port: 465
EHLO fatin
250-mx.google.com at your service, [175.139.198.14]
250-SIZE 35882577
250-8BITMIME
250-AUTH LOGIN PLAIN XOAUTH XOAUTH2 PLAIN-CLIENTTOKEN
250-ENHANCEDSTATUSCODES
250 CHUNKING
DEBUG SMTP: Found extension "SIZE", arg "35882577"
DEBUG SMTP: Found extension "8BITMIME", arg ""
DEBUG SMTP: Found extension "AUTH", arg "LOGIN PLAIN XOAUTH XOAUTH2 PLAIN-CLIENTTOKEN"
DEBUG SMTP: Found extension "ENHANCEDSTATUSCODES", arg ""
DEBUG SMTP: Found extension "CHUNKING", arg ""
DEBUG SMTP: Attempt to authenticate
AUTH LOGIN
334 VXNlcm5hbWU6
YWNjb3VudEBibG9vbWluZy5jb20ubXk=
334 UGFzc3dvcmQ6
Ymxvb21pbmc=
535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 http://support.google.com/mail/bin/answer.py?answer=14257
m4sm5929870pbg.38 - gsmtp
[STDOUT] javax.mail.AuthenticationFailedException
[STDOUT] at javax.mail.Service.connect(Service.java:319)
[STDOUT] at javax.mail.Service.connect(Service.java:169)
[STDOUT] at com.vlee.util.mail.SendMail.sendMailAdvance(SendMail.java:283)
[STDOUT] at com.vlee.servlet.ecommerce.DoMemberLogin.fnSendPwd(DoMemberLogin.java:251)
[STDOUT] at com.vlee.servlet.ecommerce.DoMemberLogin.doPost(DoMemberLogin.java:72)

May be this problem cause by Gmail account protection. Just click below link and disable security settings.It will work.
https://www.google.com/settings/security/lesssecureapps

https://www.google.com/settings/security/lesssecureapps
go to your account and turn on the security it will work

You should change the port to 587, I tested your code and it's working fine
If error still happens, please change session variable to code below:
Session session = Session.getInstance(props, new javax.mail.Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(userName, password);
}
});

By default Gmail account is highly secured. When we use gmail smtp from non gmail tool, email is blocked. To test in our local environment, make your gmail account less secure as
Login to Gmail.
Access the URL as https://www.google.com/settings/security/lesssecureapps
Select "Turn on"

Most of AuthenticationFieldException Error occur when sign-in attempted prevented, login your gmail first and go to https://www.google.com/settings/security/lesssecureapps and check turn on. I solved this kind of problem like this way.

If you are logging in to your gmail account from a new application or device, Google might be blocking that device. Try following these steps:
To protect your account, Google might make it harder to sign in to your account if we suspect it isn’t you. For example, Google might ask for additional information besides your username and password if you are traveling or if you try to sign in to your account from a new device.
Go to https://g.co/allowaccess from a different device you have previously used to access your Google account and follow the instructions.
Try signing in again from the blocked app.

Change this (set less secure app):
https://www.google.com/settings/security/lesssecureapps

The solution that works for me has two steps.
First step
package com.student.mail;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
/**
*
* #author jorge santos
*/
public class GoogleMail {
public static void main(String[] args) {
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.gmail.com");
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");
Session session = Session.getDefaultInstance(props,
new javax.mail.Authenticator() {
#Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication("conaderindicadores#gmail.com","Silueta95#");
}
});
try {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("conaderindicadores#gmail.com"));
message.setRecipients(Message.RecipientType.TO,
InternetAddress.parse("netneillip#gmail.com"));
message.setSubject("Testing Subject");
message.setText("Test Mail");
Transport.send(message);
System.out.println("Done");
} catch (MessagingException e) {
throw new RuntimeException(e);
}
}
}
Enable the gmail security
https://myaccount.google.com/u/2/lesssecureapps?pli=1&pageId=none

There are a few steps you have to keep in mind.
First, make sure you have turned off 2-way authentication of google account
Second, allow access for less secure apps-
https://myaccount.google.com/lesssecureapps
Now there are two scenarios
If you are developing it in your local machine login to your google account in your browser, this way the google recognizes the machine.
If you have deployed the application onto a server then after the first request you will get an authentication error, so you have to give access to the server, just go here to give access- https://www.google.com/accounts/DisplayUnlockCaptcha

I have been getting the same error for long time.
When i changed session debug to true
Session session = Session.getDefaultInstance(props, new GMailAuthenticator("xxxxx#gmail.com", "xxxxx"));
session.setDebug(true);
I got help url https://support.google.com/mail/answer/78754 from console along with javax.mail.AuthenticationFailedException.
From the steps in the link, I followed each steps. When I changed my password with mix of letters, numbers, and symbols to be my surprise the email was generated without authentication exception.
Note: My old password was more less secure.

2 possible reasons:
Your username may require the entire email id 'username#example.com'
Most obvious: The password is wrong. Debug to see if the password being used is correct.

trying to connect to host "smtp.gmail.com", port 465, isSSL false
You got your gmail smtp setting wrong. Gmail requires SSL. Please see tutorials on how to send email via Java via Gmail SMTP, eg: http://www.mkyong.com/java/javamail-api-sending-email-via-gmail-smtp-example/

Just in case anyone comes looking a solution for this problem.
The Authentication problems can be alleviated by activating the google 2-step verification for the account in use and creating an app specific password. I had the same problem as the OP. Enabling 2-step worked.

I had this issue as well but the solution had nothing to do with coding. Make sure you are able to connect to gmail. Ping smtp.gmail.com. If you don't get a reply check your firewall settings. It could also be a proxy setting issue.

Implement Three things with given SMTP settings
Disable two factor aunthentication: https://myaccount.google.com/security
Allow less secure apps : https://www.google.com/settings/security/lesssecureapps
Allow new devices using the link: https://g.co/allowaccess
SMTP Settings:
smtp.gmail.com
Port: 465
Use SSL
From Email Address
Gmail Username
Gmail Password
Recepient Email Address

This is because our application cant bypass 2-step verification. If you are using Gmail then here's a solution.
Click Manage your google account
Go to "Manage your Google Account"
Click Security Menu item
Go into Security Tab and enable 2-Step verification if not already enabled.
Navigate to App passwords
Select a name and generate the password. Copy the 16 letter password before you close the next window.
Select Other

I finally did it. Google doesn't allow third party apps to sign in using your actual password (since March 30th 2022 I think). You have to create an appPassword for your app in gmail. Go to manage accounts in gmail, if you haven't allowed two step verification you'll have to, then the option for creating app password will appear. You'll just type in your app's name and tap the 'generate' button. Your password will popup and you will put it down somewhere. This is the password to be used in the Authentication anonymous class up there in the question.

import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
public class SendMail1 {
public static void main(String[] args) {
// Recipient's email ID needs to be mentioned.
String to = "valid email to address";
// Sender's email ID needs to be mentioned
String from = "valid email from address";
// Get system properties
Properties properties = System.getProperties();
properties.put("mail.smtp.starttls.enable", "true");
properties.put("mail.smtp.host", "smtp.gmail.com");
properties.put("mail.smtp.port", "587");
properties.put("mail.smtp.auth", "true");
Authenticator authenticator = new Authenticator () {
public PasswordAuthentication getPasswordAuthentication(){
return new PasswordAuthentication("userid","password");//userid and password for "from" email address
}
};
Session session = Session.getDefaultInstance( properties , authenticator);
try{
// Create a default MimeMessage object.
MimeMessage message = new MimeMessage(session);
// Set From: header field of the header.
message.setFrom(new InternetAddress(from));
// Set To: header field of the header.
message.addRecipient(Message.RecipientType.TO,
new InternetAddress(to));
// Set Subject: header field
message.setSubject("This is the Subject Line!");
// Now set the actual message
message.setText("This is actual message");
// Send message
Transport.send(message);
System.out.println("Sent message successfully....");
}catch (MessagingException mex) {
mex.printStackTrace();
}
}
}

Issue sending email using gmail's smtp server and id of my website

I have created an email account for admin of my web site using google's gmail app as admin#mywebsite.com. I am able to login using the credentials on gmail's login web page.
Now i want to send email using java and this id
String host = "smtp.gmail.com";
String from = "admin#mywebsite.com";
String pass = "myPass";
Properties props = System.getProperties();
props.put("mail.smtp.starttls.enable", "true"); // added this line
props.put("mail.smtp.host", host);
props.put("mail.smtp.user", from);
props.put("mail.smtp.password", pass);
....
...
...
Session session = Session.getDefaultInstance(props, auth);
...
...
Transport transport = session.getTransport("smtp");
transport.connect(host, from, pass);
transport.sendMessage(message, message.getAllRecipients());
transport.close();
This is throwing an exception as
Exception in thread "main" javax.mail.AuthenticationFailedException
However, when i try this with gmail credentials (myid#gmail.com), it works.
Please help me out on this. Thanks in advance

Judging by the accepted answer to What mechanism does Gmail use for user authentication?, you need to connect to Google's mail server on port 465 or 587, then use STARTTLS (presumably only on port 587) and user authentication. So what you are lacking is the port 465 or 587 part.

Have you already authenticated your admin#mywebsite.com with Send As permissions in your gmail Account Settings?
If yes, then you might need to give your authentication user id and password as your gmail account.

you have to used for port number to connect with gmail.
TLS:587
SSL:465
you have to used one of them so you can send the email through gmail.

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Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Unable to send mails using smtp server-javamail - java

I found a similar problem here. Try to see if the problem is relate to an anti virus or a firewall blocking your requests.

Switch off you firewall and find in Google some security certificate that missed in you jar/lib/security I have already faced this then I have to make use phpmailer lib in php and make on API use anywhere in your code so you can try php.

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