How to send 200 cold emails per day without falling into the spam box?

Hi,

I tried the following:
1. I purchased a new domain
2. I set up a $6 Google Workspace account
2. I warmed up my new email with GMass (for 40 days) until sending 50 mails per day (all reaching inbox)
3. I used Apollo for my cold mailing campaign and I increased the number of daily sent emails by 5 everyday (working fine at first)
4. I reached 80/day and after a around 10 days all my emails were falling into spam

I don't know how to build a more efficient system. Could anyone give me some tips? I'd like to send 200 mails per day from Apollo.

Thanks

Are you adding links I'm your emails body? If not you can use gmails accounts to send 100/day per email even 1000 using Google Sheets Add One.

2 Gmails = 200/ day

With links pose more tendencies for spam.

Cheers