Question White list Security

[TBotNik]

Does anyone know a white list only secure application to lock to all a.) websites, b.) Text sources, c.) Email sources from your android devices blocking every source not in the white list. This is a reality on Linux Boxes, but not that I've found for Android,nor Win 10 & 11. please advise to my email if you know one!

TBNK

 

[VidJunky]

Welcome to Android Central forums, again as it seems. While not familiar with Linux, I know this isn't something that Android does, at least not in the same way. Like with your last question, I dropped this into Chatgpt and it suggested these actions.

Why It's Hard on Android & Windows​

Both platforms intentionally limit user control for the sake of usability and app compatibility:

• Android: Google’s ecosystem is built on data sharing and ad tracking, so strict whitelisting of domains, messages, and emails would break core functionality.
• Windows 10/11: You can do some control via firewall rules, group policy, or registry tweaks, but it's tedious, fragile, and not designed for non-enterprise users.

That said — there are partial solutions.

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CURRENT TOOLS YOU CAN EXPLORE​

For websites only (whitelist based filtering)​

1. NetGuard (Android)
   
   • Open-source firewall (no root required)
   • Lets you allow/block specific apps and addresses.
   • Can use a whitelist mode with a bit of configuration.
   • URL/domain-level filtering is possible with custom hosts/DNS.
2. RethinkDNS + Firewall (Android)
   
   • Very powerful and privacy-first
   • Supports DNS filtering and firewall rules
   • Can create allow-only DNS rules using blocklists
3. Pi-hole (Network-Wide)
   
   • Runs on Raspberry Pi or Linux server
   • Acts as a DNS sinkhole → can allow/block by domain
   • Can be configured to only allow a whitelist of domains
   • Works across all devices if you route traffic through it

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For SMS / chat apps / text messages​

Android doesn't expose SMS controls enough for this, but:

• SMS Organizer or Silence.IM allows some control over who can reach you, but no "whitelist only" SMS blockers exist natively.

Workaround: Use automation apps like Tasker or Automate, which can trigger based on incoming SMS source and block/ignore them unless they match your rules.

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For email sources​

This depends on your email client. You could:

• Use ProtonMail or Tutanota, which have strict sender filters.
• Or with Gmail, create filters to:
  
  • Mark unknown senders as spam
  • Only allow specific domains through inbox

But true whitelist-only behavior (where the app just refuses to even receive the message from a non-whitelisted address) is rare outside of corporate email systems.

Maybe these suggestions will help you.