I’m trying to organize my lists better. My new sign-ups go to the newsletter list, but old contacts from Mailchimp that accept marketing and aren’t suppressed are in a separate list which needs to be cleaned. My question is what would the best practice be for cleaning the list of old subscribers and moving the remaining subscribers to the newsletter list? Any tips you guys have will be most appreciated.
Best answer by Omar
When you mention old contacts that sounds like unengaged contacts who haven't been emailed for a while.
Normally I'd suggest exporting the active addresses and importing/adding them to the main newsletter list.
For those unengaged check https://www.klaviyo.com/blog/sunset-inactive-subscribers, https://help.klaviyo.com/hc/en-us/articles/115000931551-How-to-Run-a-Re-Engagement-Email-Campaign and https://help.klaviyo.com/hc/en-us/articles/360017518492-Creating-a-Sunset-Flow how to run sunset / reengagement campaigns.