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Protect a message to someone outside Aster with a password, and set it to expire.

Mail between Aster accounts is end-to-end encrypted with no setup. When you write to someone who uses another email service, you can require a password to open the message and choose when it stops working.

Before you begin

  • The Self-destruct options require Nova, Supernova, Duo, or Family. On other plans, the button shows that the feature requires an upgrade.
  • Start a new message. You can add a password only to a new message. When you reply or forward, you can set an expiration but not a password.
  • Choose a password that the recipient can type, and plan how to share it with them outside email.

Send a password-protected message

  1. Open the composer, add the recipient, and write your message. The Self-destruct button becomes available after you add a recipient.
  2. In the composer toolbar, select Self-destruct (the fire icon).
  3. Select Add password, which reads Require password to view.
  4. Enter the password, and then select Set Password.
  5. Send the message.

The recipient gets an email with a link to open the secure message and the date it expires. The message is decrypted in their browser with the password.

Set an expiration

  1. In the composer toolbar, select Self-destruct.
  2. Choose 1 hour, 24 hours, 7 days, or 30 days. To choose an exact date and time, select Pick date & time.

After the message expires, the link stops working and nobody can open the message, even with the password. If you don’t choose an expiration, the link lasts 30 days. No link lasts longer than 365 days.

Share the password safely

Share the password another way, such as in a phone call, a messaging app, or in person. There’s no password hint, so agree on a password the recipient can remember or store.

What the recipient sees

The recipient needs only a current web browser. They don’t create an account or install anything.

  1. They select the link in the email.
  2. The page reads This message is protected. Enter the password to view it.
  3. They enter the password and select View message.

From the same page, they can download attachments, select Send a reply to answer you, or select Delete message to remove it before it expires. A recipient can send up to 20 replies from the page. Each reply arrives in your Aster inbox.

Limits

  • After five wrong password attempts, the page locks for an hour.
  • An expired or deleted message can’t be restored. Send a new one if the recipient still needs it.
  • After the recipient reads the message, they can copy or take a screenshot of it. Expiration limits how long the link works, not what someone does with what they read.
  • If the recipient uses PGP and Aster finds their key, the composer shows Encryption available, and you can encrypt the message end to end without a password.

Troubleshooting

  • You don’t see Require password to view: Make sure you’re writing a new message, not a reply or a forward.
  • Self-destruct shows “This feature requires an upgraded plan”: These options require Nova, Supernova, Duo, or Family.
  • Self-destruct is unavailable: Add at least one recipient first.
  • The link doesn’t work for the recipient: The message might have expired, or the recipient might have deleted it. Send it again.
  • The recipient can’t open the message: Make sure they enter the password exactly, including capitalization. If the page is locked, send a new message with a new password.

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