I am not sure if this is a Sugar Market question, or a Sugar Sell question, so I'll start here in Market help.
When an address is marked in Sugar Market as "bad-mailbox", to me that means invalid for whatever reason.
When we used Sugar Sell Campaigns and we got these bounces, Sugar Sell marked the email address as Invalid.
Should that, or could that, same thing happen now between Sugar Market and Sugar Sell? Hopefully I don't have to go back and run reports to manually mark them invalid in Sugar Sell so they don't get used for any reason, even outside of Sugar Market.