[greatreorx]

It's not a bug. The problem is that most people don't know that MMS messages can be one-to-many AND that iOS 5 turned Group Messaging on by default (which causes group messages to be MMS instead of SMS).

The Group Messaging setting only affects messages you send out. If a third party wants to (or unwittingly) 'reply all' to an MMS message that included you, your individual Group Messaging setting won't stop that and you will get that message regardless of your setting.

If you don't think it should work this way, then you are asking Apple to not deliver messages that technically are addressed to you.

I do agree that Apple should have done a better job educating users on how it works.

[bmuon]

I think this is not the case. TFA seems to say that replying to a many-recipient message sent with Group Messaging off is automatically considered a "reply to all" action when it shouldn't.