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This exception has no message.
java.lang.NullPointerException at javax.mail.internet.InternetAddress.toString( at javax.mail.internet.InternetAddress.toString( at javax.mail.internet.MimeMessage.setAddressHeader( at javax.mail.internet.MimeMessage.setReplyTo( at jenkins.plugins.mailer.tasks.MimeMessageBuilder.buildMimeMessage( at hudson.tasks.MailSender.createEmptyMail( at hudson.tasks.MailSender.createFailureMail( at hudson.tasks.MailSender.createMail( at at hudson.tasks.MailSender.execute( at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.cleanUp( at hudson.model.Run.execute( at at hudson.model.ResourceController.execute( at