package javax.mail and javax.mail.internet do not exist

You need to download the JavaMail API, and put the relevant jar files in your classpath.

Download javax.mail.jar and add it to your project using the following steps:

Extract the mail.jar file
Right click the project node (JavaMail), click Properties to change properties of the project
Now go to Libraries Tab
Click on Add JAR/Folder Button. A window opens up.
Browse to the location where you have unzipped your Mail.jar
Press ok
Compile your program to check whether the JAR files have been successfully included

If using maven, just add to your pom.xml:

<dependency>    <groupId>javax.mail</groupId>    <artifactId>mail</artifactId>    <version>1.5.0-b01</version></dependency>

Of course, you need to check the current version.

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