When I read this post, I initally thought that astraia and I must live in the same complex, however the number of units did not match! We have an identical issue with an owner (and ex-EC member) who continually harrasses the EC and Strata Manager via email, misrepresents the truth and generally makes a complete nuisance of himself (together with his wife). It reached the point last year where our Strata Manager involved their lawyers, after being accused of ‘vote-stacking’ at our AGM, which was not at all the case, however as the offending owner was not returned to the EC, they felt that some sort of conspiracy theory must have been in place. The latest stunt has been to begin circulating emails they received whilst on the EC to owners, where the content involved that other owner, and generally involved an issue with the owner in question. Let’s just say that has stirred up a whole new bundle of trouble. Our Strata Managers have also proposed a significant fee increase, given the time needed to respond to the barrage of emails from these trouble-makers, and I can’t say I blame them.
Whilst it is easy to say ignore them, and that certainly would be the preference, its often not that simple, and continual disruption at EC meetings has become the norm. After 3 years as Chair, I stepped down as I could no longer bear dealing with them, and the time spent outside of working hours trying to manage their continual harrassment was not compatible with life 
I wish there was a solution, however I haven’t found it yet…..