Email Extension Plugin in Jenkins: What It Is and How It Works

The Email Extension Plugin in Jenkins is a tool that lets you send customized email notifications based on build results and conditions. It extends Jenkins' basic email feature by allowing detailed control over who gets emails, when, and what content they include.

How It Works

The Email Extension Plugin works like a smart mailman for your Jenkins builds. Instead of sending the same email to everyone every time, it lets you set rules about when and to whom emails should be sent. For example, you can send an email only if a build fails or only to the people who committed code that caused the failure.

It uses templates to customize the email content, so you can include build details, logs, or links. This way, the right people get the right information without extra noise. Think of it as setting up a custom alert system that fits your team's needs perfectly.

Example

This example shows how to configure the Email Extension Plugin in a Jenkins pipeline script to send an email when a build fails.

groovy

pipeline {
  agent any
  stages {
    stage('Build') {
      steps {
        // Simulate build step
        echo 'Building...'
        // Uncomment next line to simulate failure
        // error 'Build failed'
      }
    }
  }
  post {
    failure {
      emailext(
        subject: "Build Failed: ${env.JOB_NAME} #${env.BUILD_NUMBER}",
        body: "<p>Build failed. Check console output at <a href='${env.BUILD_URL}'>${env.BUILD_URL}</a></p>",
        recipientProviders: [[$class: 'DevelopersRecipientProvider']]
      )
    }
  }
}

Output

If the build fails, an email is sent to all developers who committed changes in this build with a subject and a link to the build details.

When to Use

Use the Email Extension Plugin when you want more control over Jenkins email notifications than the basic email feature offers. It is helpful when you need to:

• Notify only specific people based on build results or changes.
• Customize email content with build details, logs, or links.
• Send emails on different build events like success, failure, unstable, or fixed builds.
• Reduce email noise by avoiding unnecessary notifications.

For example, a team can use it to alert developers only when their code breaks the build, helping them fix issues faster without bothering others.

Key Points

• The Email Extension Plugin enhances Jenkins email notifications with flexible rules.
• It supports templates for rich, customized email content.
• You can target emails to specific users or groups based on build status.
• It integrates easily with Jenkins pipelines and freestyle jobs.

Key Takeaways

The Email Extension Plugin allows customized and conditional email notifications in Jenkins.

It helps notify the right people with detailed build information only when needed.

You can use it in pipelines to send emails on specific build events like failures.

It reduces unnecessary emails by targeting recipients based on rules.

Templates let you create clear, informative emails with links and logs.