Categories: JavaMail

Authentication using JavaMail SMTP

Many SMTP servers use an authentication system as an extra layer of security in their mail transport. If you need to send email to such a server with JavaMail, the library provides a convenient abstraction of the process. First, create an anonymous inner class that implements javax.mail.Authenticator and contains the password authentication information:

Authentication using JavaMail SMTP

Authenticator authenticator = new Authenticator() {
private PasswordAuthentication authentication;
 
{
authentication = new PasswordAuthentication("username", "password");
}
 
protected PasswordAuthentication getPasswordAuthentication() {
return authentication;
}
};

Next, create instances of java.util.Properties and javax.mail.Session that will be used to build the message transport. The important differences from JavaMail usage here are the extra auth property and the passing of the authenticator object to the mail session. (Note that all values of the Properties instance are strings — this is required by the class. Booleans, integers, et cetera should be passed as strings to this object.)

Properties props = new Properties();
props.put("mail.transport.protocol", "smtp");
props.put("mail.smtp.host", "smtp.somewhere.com");
props.put("mail.smtp.port", "587");
props.put("mail.smtp.auth", "true");
Session session = Session.getDefaultInstance(props, authenticator);

Now that our Session is prepared, we can send the message as normal. The authentication model is carried within the mail session, so each message can take it in and reuse its information.

 

Message message = new MimeMessage(session);
 
message.setFrom(new InternetAddress("from@somewhere.com"));
message.addRecipient(RecipientType.TO, new InternetAddress("xyz@somewhere.com"));
 
message.setSubject("Hello world!");
message.setContent("Sent via an SMTP server with authentication.", "text/plain");
 
Transport.send(message);
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Dinesh Rajput

Dinesh Rajput is the chief editor of a website Dineshonjava, a technical blog dedicated to the Spring and Java technologies. It has a series of articles related to Java technologies. Dinesh has been a Spring enthusiast since 2008 and is a Pivotal Certified Spring Professional, an author of a book Spring 5 Design Pattern, and a blogger. He has more than 10 years of experience with different aspects of Spring and Java design and development. His core expertise lies in the latest version of Spring Framework, Spring Boot, Spring Security, creating REST APIs, Microservice Architecture, Reactive Pattern, Spring AOP, Design Patterns, Struts, Hibernate, Web Services, Spring Batch, Cassandra, MongoDB, and Web Application Design and Architecture. He is currently working as a technology manager at a leading product and web development company. He worked as a developer and tech lead at the Bennett, Coleman & Co. Ltd and was the first developer in his previous company, Paytm. Dinesh is passionate about the latest Java technologies and loves to write technical blogs related to it. He is a very active member of the Java and Spring community on different forums. When it comes to the Spring Framework and Java, Dinesh tops the list!

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