Poll Mail box plugin is unable to connect to Mail Server(Gmail),even though i am able to telnet the mail server successfully with 993 port.

Setting Poll Mail Box Trigger in Jenkin -->

Hostname -> imap.gmail.com
Username -> gmail_user@gmail.com
Password -> password of gmail account

Advanced Email Properties ->

1. Connection configuration
   storeName=imaps

1. Search configuration
   folder=INBOX
   subjectContains=jenkins >
   receivedXMinutesAgo=1440

1. JavaMail configuration
   mail.debug=true
   mail.debug.auth=true
   mail.imaps.host=imap.gmail.com
   mail.imaps.port=993

Error Message -->

Connecting to the mailbox...
Error : javax.mail.MessagingException: Connection reset;
  nested exception is:
java.net.SocketException: Connection reset
at com.sun.mail.imap.IMAPStore.protocolConnect(IMAPStore.java:665)
at javax.mail.Service.connect(Service.java:295)
at javax.mail.Service.connect(Service.java:176)
at org.jenkinsci.plugins.pollmailboxtrigger.mail.MailReader.connect(MailReader.java:58)
at org.jenkinsci.plugins.pollmailboxtrigger.PollMailboxTrigger.checkForEmails(PollMailboxTrigger.java:238)
at org.jenkinsci.plugins.pollmailboxtrigger.PollMailboxTrigger$PollMailboxTriggerDescriptor.doTestConnection(PollMailboxTrigger.java:584)
at java.lang.invoke.MethodHandle.invokeWithArguments(Unknown Source)
at org.kohsuke.stapler.Function$MethodFunction.invoke(Function.java:343)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:184)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:117)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:129)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:845)
at org.kohsuke.stapler.MetaClass$5.doDispatch(MetaClass.java:248)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:58)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:715)