Sealed sender in Dixl

Sealed sender lets Dixl deliver a message without the server learning who sent it — only the recipient sees the sender.

What it changes

Normally the envelope of every message carries the sender’s identifier in plaintext, so the server knows where to route replies. With sealed sender, that identifier is encrypted together with the message. The server sees only “someone is sending something to user X.”

When it’s used automatically

• for people in your contacts,
• for people you’ve messaged before,
• for anyone you’ve shared your profile with.

“Allow from anyone”

In Settings › Privacy › Advanced you can turn on Allow from anyone, so sealed-sender messages are accepted even from accounts you haven’t interacted with. Useful if you share your username publicly — the trade-off is that strangers’ messages arrive without revealing the sender until you open the chat.

What’s still visible to the server

Sealed sender hides the sender. It does not hide:

• the recipient (the server must know where to deliver),
• the approximate message size,
• connection metadata such as the sender’s IP address.

FAQ

Does sealed sender make me anonymous? No — it hides the sender from the server, not your IP or the recipient.

Do I need to enable it? No, it’s automatic for your contacts and people you’ve messaged. “Allow from anyone” is the only optional toggle.

Does it affect delivery speed? No, delivery works the same.

Can the recipient still see who I am? Yes — sealed sender hides the sender from the server, never from the person you’re messaging.