Ask HN: High-quality email client for iPhone with multiple accounts support?

I've been using FairEmail on my Android device and it's been great. It has all the features I need, including support for multiple email accounts. I'm now in the market for a similar app for my iPhone, but I haven't been able to find one that matches FairEmail's quality.

Can anyone recommend a good email client for iPhone that supports multiple accounts and is similar in quality to FairEmail? I would appreciate any suggestions. I would consider both free and paid options, however, would prefer something free (and, if possible, FOSS). Thank you.