I recently received an email from Area51 pointing to this question about merging a few sites together.
I'm not sure whether the email was auto-generated, or done by a real human, but in the
to field was listed the email addresses of all of the users who had (I assume) shown an interest by following the proposal.
If the email is auto-generated, I would class this as a bug that needs fixing as I don't really want my email address scattering to all of the other users who follow the group. If the email was sent by a human, someone needs to be educated as to why this is not a great approach.