Global White List

Is there a Global Whitelist that would override SpamAsasin, all domain & user level blacklists? I ask because we manage a number of accounts that we might need to send maintenance or outage notifications to and it would be nice for us to have a way to add our address to a global whitelist that would override all our customers domain and user level (boxtrapper) spam filters.... The Barracuda works this way, there's a global whitelist that overrides all the domain and user level whitelists. Otherwise without this we would have to go into each domain level whitelist for SpamAssasin and add our notification address. This is a lot of work and would have to be done every time we add a new customer account/domain.