Thank you for your patience while we looked into this for you. On Friday the 22nd, the Active.com team began the migration of all message boards from the Community platform to a new platform.
At the onset of the migration, a process was missed which would have applied filters needed to prevent mass emails of blog notifications to go out. Fortunately, a very small percentage of people who are signed up to be notified of the blog updates were sent the multiple emails.
For those who were effected, please accept our sincere apologize for this oversight. The Community migration will be completed this week, but we do not expect anyone else to be effected during this migration or any future Community migrations.