When an email is sent using NetMail in Raiser's Edge, a link is automatically included that reads "Click here if you do not want to receive further emails". This link format and location cannot be customized. However, following is more information on how this link functions.
If a constituent clicks the link, a transaction is downloaded under email opt-outs in NetSolutions. When these are imported, the Requests no email checkbox is marked on the constituent's Bio 1 tab.