Jenkins Pipeline code for Sending an email on Build Failure

 pipeline {  
     agent any  
     stages {  
         stage('Test') {  
             steps {  
                 sh 'echo "Fail!"; exit 1'  
             }  
         }  
     }  
     post {  
         always {  
             echo 'This will always run'  
         }  
         success {  
             echo 'This will run only if successful'  
         }  
         failure {  
             mail bcc: '', body: "<b>Example</b><br>Project: ${env.JOB_NAME} <br>Build Number: ${env.BUILD_NUMBER} <br> URL de build: ${env.BUILD_URL}", cc: '', charset: 'UTF-8', from: '', mimeType: 'text/html', replyTo: '', subject: "ERROR CI: Project name -> ${env.JOB_NAME}", to: "foo@foomail.com";  
         }  
         unstable {  
             echo 'This will run only if the run was marked as unstable'  
         }  
         changed {  
             echo 'This will run only if the state of the Pipeline has changed'  
             echo 'For example, if the Pipeline was previously failing but is now successful'  
         }  
     }  
 }

post {
 always {
   sh 'echo "This will always run"'
 }
 success {
  sh 'echo "This will run only if successful"'
 }
 failure {
  sh 'echo "This will run only if failed"'
 }
 unstable {
  sh 'echo "This will run only if the run was marked as unstable"'
 }
 changed {
  sh 'echo "This will run only if the state of the Pipeline has changed"'
  sh 'echo "For example, the Pipeline was previously failing but is now successful"'
  sh 'echo "... or the other way around :)"'
 }
}

To ignore a failed step in declarative pipeline you basically have two options:

Use script step and try-catch block (similar to previous proposition by R_K but in declarative style)
stage('someStage') {
    steps {
        script {
            try {
                build job: 'system-check-flow'
            } catch (err) {
                echo err.getMessage()
            }
        }
        echo currentBuild.result
    }
}
Use catchError
stage('someStage') {
    steps {
        catchError {
            build job: 'system-check-flow'
        }
        echo currentBuild.result
    }
}
In both cases the build won't be aborted upon exception in build job: 'system-check-flow'. In both cases the echo step (and any other following) will be executed.

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