The first really interesting content about spam filters on youtube, appreciate it! BTW do you hear about email warm up services? Is that make sense to use them for the warming up my email or it doesn’t work? Maybe you are planning to run something like that? PS regarding spam filters, I also mentioned that you need to update your templates and messages regularly, I used one message and sent it 3 months in a raw, I had 30-40% open rate, but from the last week it drops to 10-15% open rate, after long research I decided to change the text and WOW open rate increased to 40-50%. So my recommendation is to update your messages every month and you will see some magic)
