javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed; 
 boundary="----=_Part_232_854096954.1535491539067"
 at javax.activation.ObjectDataContentHandler.writeTo(DataHandler.java:896)
 at javax.activation.DataHandler.writeTo(DataHandler.java:317)
 at javax.mail.internet.MimeBodyPart.writeTo(MimeBodyPart.java:1476)
 at javax.mail.internet.MimeMessage.writeTo(MimeMessage.java:1772)
 at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1099)
Caused: javax.mail.MessagingException: IOException while sending message;
 nested exception is:
 javax.activation.UnsupportedDataTypeException: no object DCH for MIME type multipart/mixed; 
 boundary="----=_Part_232_854096954.1535491539067"
 at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:1141)
 at javax.mail.Transport.send0(Transport.java:195)
 at javax.mail.Transport.send(Transport.java:124)
 at org.jenkinsci.plugins.workflow.steps.MailStep$MailStepExecution.run(MailStep.java:142)
 at org.jenkinsci.plugins.workflow.steps.MailStep$MailStepExecution.run(MailStep.java:128)
 at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution$1$1.call(SynchronousNonBlockingStepExecution.java:50)
 at hudson.security.ACL.impersonate(ACL.java:290)
 at org.jenkinsci.plugins.workflow.steps.SynchronousNonBlockingStepExecution$1.run(SynchronousNonBlockingStepExecution.java:47)
 at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
 at java.util.concurrent.FutureTask.run(FutureTask.java:266)
 at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
 at java.lang.Thread.run(Thread.java:748)