Yes, constituents who are opt-out of site wide email will still receive receipts, autoresponders, TellAFriend, eCard, and and emails sent from Participant Centers.

Note that there are three systems by which messages are sent out from Luminate Online. For a more in-depth description of these systems, check out solution article BB743640. Opting out of email emails sent from the Email Campaign system. Emails sent from the other two systems wil not be affected by the opt out.