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:

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