getting Email from a response to my post only

Click your avatar picture near the upper right corner (slightly to the left of the pencil) and select PREFERENCES then set the Email Preferences to OFF for what you don't want and click Save at the bottom left

AND

Another feature is that Jive is oriented toward social networking... so every time you start or reply to a message you are automatically added to a FOLLOW list... meaning you receive a notification of every subsequent message in that thread

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Click the FOLLOW link at the upper right and select STOP FOLLOWING... and don't click the link again to check your status, as you will then be added to the CONNECTIONS STREAM and you will have to uncheck that option as well

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And, after you post in a message thread and select Stop Following, you need to do it all over again the next time you add a reply to the same message thread, since EVERY POST adds you to the automatic Follow list