Some emails working, some blocked

I moved my domain from one free cloudflare plan/account to another and after doing so, some email was coming through (primarily automated emails like newsletters and advertisements) but personal emails from clients were not. I have gone back in and made sure all my DNS records are corrected to what they should be, but I'm pretty new to Cloudflare and not completely confident about it - and I'm just learning that support isn't really accessible (which explains why I haven't been able to reach sales in over a month).

Why would some emails come through but not others?
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