This has been bugging me for quite some time.  Why is it that I sometimes get multiple emails on single posts to a thread I’ve subscribed to.  And why am I sometimes not notified on subsequent posts to other threads?
I’ve checked my settings on my Control Panel, and they look fine.  Any ideas?
Seeker
             
            
              
              
              
            
            
           
          
            
            
              IANA Admin but I think I might know the problem. This is still a WAG though.
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Someone does a multiple post by mistake. The system catches it on the boards now (and gives the duplicate post message) but the email still gets sent out. In this case the multiple e-mail notifications are all the same. This happens quite a lot. 
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If I am checking my subscribed threads without checking my email I would start to get other email notifications. This would explain multiple e-mail notifications that are different. 
I think I’m right on the first one but I rarely check the boards before my email so the second could (and probably is) wrong.
Hope I helped.