Re: DuckDuckGo:
You can sign-up and manage your aliases from any browser on any OS
But not on the TOR or Mull browsers on Android:
ETA: I use both DDG and SimpleLogin. I recently bumped up against the ten alias limit in SL, but I prefer the ease of creating outgoing aliases in their dashboard vs the DDG method of manually typing with underscores. That said, they both come in handy and I have dozens of DDG aliases that helped me break my dependence on gmail as my single email provider. Never tried Addy.
Love jails. My server didn’t move with me to Central America, and I miss Free/TrueNAS jails