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A locked folder asks for a second password before it opens, even when you are already signed in. Your mail is encrypted either way, and locking adds a separate layer on top for the folder you choose.

Locked folders are part of Nova and higher plans.

Lock a folder

1. In the sidebar, find the folder you want to lock.
2. Open the folder’s menu, and select Lock.
3. Enter a password twice, and then select Set Password.

Use at least 8 characters. Aster shows a Password strength meter and asks you to choose a stronger password when the meter stays at the lowest levels.

Aster cannot recover this password. It is not your account password, support cannot reset it, and no one can open the folder without it. Store it somewhere you will not lose it.

Open a locked folder

Select the folder, enter its password, and then select Unlock.

After 10 failed attempts in 15 minutes, Aster stops accepting attempts for that folder for a short time. A correct password clears the count.

Choose when the folder locks again

1. Go to Settings > Reading & Conversations.
2. Under Protected Folders, set Folder Lock Mode:
   • Unlocked for session keeps the folder open until you close the app or your session ends.
   • Lock on leave locks it as soon as you move to another view, so you enter the password each time you come back.

What locking hides

While a folder is locked:

• Its messages stay out of search results, and the folder itself stays out of folder search.
• New mail in it raises no notification.
• Its messages are excluded from the subscription scan, so senders that write only to that folder don’t appear in Subscriptions.

Change or remove the password

1. Open the folder’s menu, and select Remove lock.
2. Switch to Change Password to set a new one, or stay on Remove Protection to take the password off.
3. Enter your current password, and confirm.

After you remove the password, anyone signed in to your account can read the folder, so keep your account password and two-factor authentication strong.

Delete a locked folder

Deleting a locked folder asks whether to destroy the mail inside. To preselect that option every time, go to Settings > Reading & Conversations, and turn on Purge Protected Folder Contents. Mail destroyed this way does not go to Trash and cannot be restored.

Troubleshooting

• You forgot the password: no one can recover it, and support cannot reset it. The folder and its mail stay locked.
• Lock isn’t in the menu: locked folders need a Nova plan or higher. See Plans and pricing.
• A message you expect is missing from search: check whether it sits in a locked folder, and unlock the folder first.

Related articles

• Organize your mail
• How Aster encryption works
• Change your password or add a passkey
• Plans and pricing