When an email recipient from a Constituent list marks the global email opt-out check box on the User Email Preferences Form part, this sends a profile update to The Raiser's Edge which marks the "Requests no email" box on the corresponding constituent record when processed.
Unchecking/clearing the "Requests no email" checkbox on the constituent record in The Raiser's Edge does change the BBNC Opted-out status from "Yes" to "No" after manually refreshing the List in NetCommunity. The reverse of this is also true.
Note: Repeat mailings to users who have opted-out could result in a report of Spam. Reports of Spam may be blocked by Blackbaud to comply with Spam regulations. When a constituent marks email sent via a Blackbaud NetCommunity site as SPAM, Blackbaud takes the proactive measure of placing the constituent's email address on a blacklist. This ensures no further email can be sent to the email address that was used. This is a measure for protecting the organization's reputation as an email sender. Please follow the instructions in the Knowledgebase Article, How to have an email address removed from the Blackbaud blacklist.