User blog comment:DaNASCAT/Technical Update:September 24, 2013/@comment-460966-20130925121118/@comment-126761-20130926132253

We have turned off the 'user joined' emails for the moment, and we're working on several fronts to deal with the source of the issue. Please do let us know if you are continuing to experience any unusual issues with your wikis, preferably via Special:Contact.