I am trying to send an email in a java application calling this method:

public static void sendEmail() {

// Create object of Property file

Properties props = new Properties();

// this will set host of server- you can change based on your requirement

props.put("mail.smtp.host", "smtp.office365.com");

// set the port of socket factory

//props.put("mail.smtp.socketFactory.port", "587");

// set socket factory

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

// set the authentication to true

props.put("mail.smtp.auth", "true");

// set the port of SMTP server

props.put("mail.smtp.port", "587");

// This will handle the complete authentication

Session session = Session.getDefaultInstance(props,

new javax.mail.Authenticator() {

protected PasswordAuthentication getPasswordAuthentication() {

return new PasswordAuthentication("xx@mail.com", "xx");

}

});

try {

// Create object of MimeMessage class

Message message = new MimeMessage(session);

// Set the from address

message.setFrom(new InternetAddress("xx@mail.com"));

// Set the recipient address

message.setRecipients(Message.RecipientType.TO,InternetAddress.parse("yy@mail.com"));

// Add the subject link

message.setSubject("Testing Subject");

// Create object to add multimedia type content

BodyPart messageBodyPart1 = new MimeBodyPart();

// Set the body of email

messageBodyPart1.setText("This is message body");

// Create object of MimeMultipart class

Multipart multipart = new MimeMultipart();

// add body part 2

multipart.addBodyPart(messageBodyPart1);

// set the content

message.setContent(multipart);

// finally send the email

Transport.send(message);

System.out.println("=====Email Sent=====");

} catch (MessagingException e) {

throw new RuntimeException(e);

}

}

but for some reason when the debug hits Transport.send(), I got this exception:

com.sun.mail.smtp.SMTPSendFailedException: 530 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM [DB6PR0802CA0037.eurprd08.prod.outlook.com]

why is this happening even though I used the Authenticator()?

解决方案

If you connect via port 587 you initially start a plain connection where you have to start TLS by explicitly sending the STARTTLS-command. You have to tell JavaMail to do that, otherwise it will try to proceed unsecured. The SMTP-server doesn't send any authentication-mechanism-informations unless the TLS-connection is established, so JavaMail is assuming that no authentication is needed and tries to send the mail without.

Add the following entry to the properties:

props.put("mail.smtp.starttls.enable", "true");

WIth that JavaMail should try to switch to TLS before trying to authenticate.

If that fails, you need to enable debugging by setting the property

props.put("mail.debug", "true");

and post the output here.