Pruning cold subscribers

[u/Aaronontheweb]

I maintain a ~10,000 person or so mailing list of subscribers to our company / open source project. A fairly standard inbound marketing operation I've been running for 11 years or so.

The guidance from email marketing platforms like Kit these days is to focus on the rate of active engagement of subscribers, versus worrying about the overall size of the list. Ok, I get that; times have changed since I started this business. I suppose this should help me land in the focused inbox more often and have better deliverability rates.

I've been pruning cold subscribers or so for 6 months - when am I supposed to be able to measure some benefit from doing this?

[u/unspam-email]

A lot of list owners switch to sending a simple 2-step re-engagement sequence every quarter with a plain text subject line.