Company I worked at did have bulk loads/unloads every so often. This didn't need to be fixed for outgoing emails, or at least wasn't a priority. If you unsubscr

Company I worked at did have bulk loads/unloads every so often. This didn't need to be fixed for outgoing emails, or at least wasn't a priority. If you unsubscribed, you'd get taken on/off the generic newsletter-style mailings immediately. Things which were less common (e.g. surveys) could take a while. That wasn't an issue. If someone who joined today didn't receive something from the survey mailer, that was a-okay. For unsubscribes, people didn't complain. I suspect that was because (1) Our customers trusted us. (2) Most customers received no more emails. The number of people who got a second email from some auxiliary system was very small. But we couldn't guarantee immediate, full unsubscribes. Regarding competency, security, and privacy, those are rare resources in the tech industry. Most companies couldn't care less about security of user data or privacy. Most also can't achieve competence.