Ask HN: iOS e-mail App with customizable “From” field?

I'm using a catch-all domain for all my e-mail communication. I'm also using iOS and currently have to log in to my web panel via Firefox/Safari when I want to write someone with a custom "From" address. It's really unpleasant.

Is there software for iOS which allows me to set the the "From" field on the fly without complicated account/identity management? Thunderbird would be something which has this, but it's desktop only.

The native Mail app only lets me allow to change the sender account but there's no way to modify the From address.