iOS / macOS email clients - other than stock Mail.app, what's most secure?

I'm sick of the stock mail app on apple products missing key features like snooze - even in recent updates. So I'm looking around for a client that I can use with my main iCloud accounts and my gmail burner.

I'm not a privacy expert but do care about how my personal data is shared

What options do I have? Canary gets mentioned regularly - I know that push alerts necessitate them storing emails on a server but other than …

app clients email ios macos mail privacy stock