09:38:39 - ERROR: Step ‘E-mail Notification’ aborted due to exception: 
 09:38:39 - ERROR: Step ‘E-mail Notification’ aborted due to exception: 
 09:38:39 - java.lang.ClassNotFoundException: javax.activation.DataSource
 09:38:39 - at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471)
 09:38:39 - at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588)
 09:38:39 - at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
 09:38:39 - Caused: java.lang.NoClassDefFoundError: javax/activation/DataSource
 09:38:39 - at jenkins.plugins.mailer.tasks.MimeMessageBuilder.buildMimeMessage(MimeMessageBuilder.java:198)
 09:38:39 - at hudson.tasks.MailSender.createEmptyMail(MailSender.java:403)
 09:38:39 - at hudson.tasks.MailSender.createBackToNormalMail(MailSender.java:208)
 09:38:39 - at hudson.tasks.MailSender.createMail(MailSender.java:196)
 09:38:39 - at hudson.tasks.MailSender.run(MailSender.java:111)
 09:38:39 - at hudson.tasks.Mailer.perform(Mailer.java:175)
 09:38:39 - at hudson.tasks.Mailer.perform(Mailer.java:138)
 09:38:39 - at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
 09:38:39 - at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741)
 09:38:39 - at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690)
 09:38:39 - at hudson.model.Build$BuildExecution.post2(Build.java:186)
 09:38:39 - at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635)
 09:38:39 - at hudson.model.Run.execute(Run.java:1843)
 09:38:39 - at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
 09:38:39 - at hudson.model.ResourceController.execute(ResourceController.java:97)
 09:38:39 - at hudson.model.Executor.run(Executor.java:429)