Email Marketing: List Warm up

Hello

I'm sure this is in the wrong section, admin feel free to move.

I'm looking for someone that has knowledge on the best way to warm up cold (or purchased ) email lists..

Been giving them free content, but for some reason, even with 0 complaints registered, messages are being funnelled to spam folder...

Thanks

You need to study a bit more the gazillion factors to hit the inbox correctly (and eventually in big scale). This has nothing to do with giving free or paid content.

i think the best way for you is to clean your list of spam traps and hard bounces. Send them few times and remove the complaints by adding unsuscribers into it.
this makes yourself very good with your lists in hand