Process by which email addresses which bounce and email adresses of users who complain loud and long about being spammed are removed. Not a substitute for proper list management.
The process of removing email addresses from a mailing list at the request of individuals. This leaves a clean list of people who do not mind receiving messages. This may require the cooperation of ISPs to forward email complaints to companies.
Removing email addresses from a mailing list, after receiving opt-out requests.