I don't know if I understand email warm-up
I've started learning about email warm-up here on Reddit, and have read up on all the usual suspects: Warmy, Lemlist, etc.
What I don't understand is the process. My initial thinking was I'm supposed to use a service that will be sending warm-up emails for me (in the background to people I don't know). Then over time, as the domains mature, I'd step in and start sending emails of my own. Is this correct?
I'm not worried about lead lists or making sure the emails are valid; I've got that covered. I'm just not sure what the warm process should be.
Basically, I have a lot of contacts I work with, but many have the response of "nothing brewing right now, but I'll get you in next time". I want to offload those contacts and just have email check-in cycles occur so I don't have to waste time doing check-ins. I've got the domains ready; I just don't know the real process to warm them up.
Experts, please help!