When a user opts out of emails from NetCommunity, the request no email checkbox will be marked on both the Bio 1 tab and the NetCommunity tab Has requested no email. 

Note: there may be rare times when the NetCommunity tab doesn't update, but this is only cosmetic. As long as Requests No Email is marked on the Bio 1 tab of the Raiser's Edge record, the NetCommunity website will respect this value. The NetCommunity website ignores the value on the NetCommunity tab of the record.

Additional Resource
What changes in the Raisers Edge when someone opts out of NetCommunity emails?