There was a big update earlier this week - all 'notifications' defaulted to 'on', so as soon as you post in a thread it thinks you want to 'follow' that thread and every time there is a post in that thread you get and email - it will also start to follow random people and notify you when ever they post.
There have been a number of threads on the problem.
As Ian said - go into your 'set-up' and un-tick all the notifications and you will be back to 'as you were'.
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Alan de Enfield's post in Inundated with emails - why? was marked as the answer