We have a random issue where notifications are continuously being received, every 20mins for the same item....is anyone else experiencing this issue, is there a reported problem and/or fix
It sounds like your instance is hitting the timeout before getting a "message received" report from the recipient's email server. This is apparently more common with Microsoft Exchange, but it can happen with any mail server. If your Exchange server is having other problems you may want to wait until that's fixed before doing anything, because fixing Exchange will almost certainly fix this problem.
Instructions for fixing this are here: https://confluence.atlassian.com/confkb/email-notifications-from-confluence-are-duplicated-using-microsoft-exchange-server-660966544.html
For the sake of interest, here is a similar article for when it's happening in JIRA with a bit more information and links to some useful comments: https://confluence.atlassian.com/jirakb/duplicated-issue-creation-comments-or-notifications-280068481.html
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