SimpleLogin | Anti-spam | F-Droid - Free and Open Source Android App Repository
https://f-droid.org/en/packages/io.simplelogin.android.fdroid/
公式サイトから (Play Store だけでなく) F-Droid へのリンクがあって、すげえ
f-droid.orgSimpleLogin | Anti-spam | F-Droid - Free and Open Source Android App RepositoryProtect your email inbox with a secure and open source solution by SimpleLogin