I am brand new to ConvertKit. I imported about 3500 accounts from another email campaign company and haven't sent anything out in over a year, and some have never emailed. Is an email re-engagement the preferred option for pruning the list? Does it hurt my deliverability right from the start? I have read the "How to Prune Cold Subscribers" article. Should it be done now as the first thing I do? Any advice would be greatly appreciated. Thanks in advance!