I read an article about this recently, the laws he was charged with have to do with illegally smuggling parts of a protected species into the US.

https://apnews.com/article/giant-sheep-clone-breed-trophy-hunt-d3a2b57886980266abeac69c44b70b2a

Fairmail is good. My issue with it is that the F-Froid version did not work with my provider, so I’ve been using k-9 mail instead.

It’s also foss, and the F-Droid version works with my provider. It’s really nice and fully featured.