Oracle Apps DBA

Issue: We came across an Issue that notification remains sitting in INBOX not processed to either PROCESS or DISCARD folder. Also we noticed the following error after changing the log level to statement. May 1, 2015 4:59:42 PM EDT]:1430513982388:Thread[ inboundThreadGroup1,5, inboundThreadGroup]:0:-1::-1:-1:ERROR:[ SVC-GSM-WFMLRSVC-6998306-10006 : oracle.apps.fnd.wf.mailer. IMAPInboundProcessor.read()]: Problem encounted when reading new messages -> javax.mail. FolderClosedException: * BYE Connection down [May 1, 2015 5:04:27 PM EDT]:1430514267056:Thread[ outboundThreadGroup1,5, outboundThreadGroup]:0:-1::-1:-1:ERROR:[ SVC-GSM-WFMLRSVC-6998306-10006 : oracle.apps.fnd.wf.mailer. SMTPOutboundProcessor.send( Message)]:Problem encountered when sending to >]]} -> javax.mail.MessagingException: 451 Timeout waiting for client input [May 1, 2015 5:04:27 PM EDT]:1430514267056:Thread[ outboundThreadGroup1,5, outboundThreadGroup]:0:-1::-1:-1:ERROR:[ SVC-GSM-WFMLRSVC-69983