Best cross platform email client

I am moving away from Protonmail as they do not support certain integrations and features I need for business applications. I just bought a year of email service from NameCheap mostly because it was cheap and I already have my domain with them. I want to get away from having 3 different applications on my phone for different email services I have and would like to have a desktop client for my computers.

I am currently running Fedora 35 KDE Plasma on both my desktop and laptop as well as an iPhone. Ideally same/similar application for both devices but at this point I just need to consolidate so I would settle for one application for my computers and another for my iPhone.

Any suggestions?

Thunderbird for desktop comes first to mind.
On iPhone I use the build-in mail client. It does a good enough job for the MS and Google services, that I didn’t bother to look for specialized apps.

Edit:
Mailspring was recommended to me some time ago but I didn’t check it out.

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