Retry Discard mail from workflow mailer.
If Non EBS User(R12.1.3) send mail a to IMAP Mail address it getting a "Warning For Unsolicited Mail" mail form oracle workflow mailer and this mail will transfer in Discard folder.
At what time discard mail again pick a oracle workflow mailer?,recently i received a 5 to 6 months old mail which is in the discard folder.
Subject:Warning For Unsolicited Mail
Body:
Messages sent to this account are processed automatically by the Oracle Workflow Notification Mailer. The message you sent did not appear to be in response to a notification. If you are responding to a notification, please use the response template that was included with your notification. Take care to include the 'NID' line of the template in your reply. If you are not responding to a notification, please do not send mail to this account.