Zimbra Webmail Spam / Junk Mail Frequently Asked Questions

Most filtering of unsolicited automated email (also known as spam or junk mail) is handled by a spam filter before those email messages reach their Inbox.

Email that might possibly be junk mail, but is not certain to be junk, is placed in their Junk folder. You can review these messages and either move them out of the Junk folder or delete them. If you do not move or delete the messages, they are purged after 30 days.

If you have an incorrect message marked as spam, check for the following:

  • Messages you have bcc'd yourself in may go to spam.
  • Spammy subjects such as blank subjects or short 1-2 word subject lines
  • Emails with no content
  • Emails with only a url as content

Some unwanted messages may not be fully categorized as spam and are not placed in the Junk folder (ie. weekly newsletters and advertisements from legitimate companies). The best way to handle unwanted mail from legitimate senders is to unsubscribe from the mailing list.

Mark Email as Spam

  1. Select the message to mark as junk.

  2. On the toolbar, select the Spam button.


You can also right-click the message and select Mark as Spam.

The email is moved to the Junk folder.


Mark Email as Not Spam

Sometimes messages that are not junk are placed in the Junk folder. You can move the messages to the appropriate folder in a number of ways: Drag the message to another folder, Select message and click Not Spam, or Right-clicking the message and selecting Mark as Not Spam.

  1. Drag the message to another folder.


  2. Select the message and click Not Spam on the tool bar


  3. Right-click the message and select Mark as Not Spam. The selected message moves to their Inbox.


A confirmation message will appear at the top relaying the number of messages marked as not spam.


Using the Unsubscribe Button

One risk of unsubscribing from spam is opening the actual message. This button allows the server to request the unsubscribe and removes the risk of malicious emails. A message with the correct unsubscribe information that is not in the Junk folder will display an Unsubscribe button in the action bar of the webmail interface. If the message doesn't have valid unsubscribe information, a request attempt will be sent, but no harm will come to the customer's account or computer.

Selecting the button will present a small banner notification above the menu bar indicating an unsubscribe has been requested.

Only one message can be unsubscribed from at a time. When unsubscribe is requested, the server initiates the call to the unsubscribe information from the sender, so there is no danger in opening the message and visiting a third-party site.

This feature is only available in the "Advanced (AJAX)" webmail view. It is not available on Standard HTML or in the mobile view at this time.

Empty the Junk Folder

The contents of the Junk folder are automatically purged after an administration-configured number of days. But you can empty the Junk folder any time.

  1. Right-click the Junk folder and select Empty Junk.

  2. Click OK when prompted.


Spam Mail Options

If you notice that certain email addresses are always being incorrectly added to their Inbox or Junk folder, you can identify those addresses to block or not block.

  1. Go to the Preferences > Mail page.

  1. Scroll to the Spam Mail Options section.

  2. In the Block (blacklist) messages from text box, enter email addresses that should always be treated as junk. You can list up to 1000 addresses.

    1. If you wish to blacklist a whole email domain, enter in the domain.ext in the textbox. (eg, for spam@spammail.com, you would enter spammail.com)

  3. In the Allow (whitelist) messages from text box, enter email addresses you trust that for some reason end up in their Junk folder, such as newsletters you subscribe to. Messages from these email addresses are never blocked. You can list up to 1000 addresses total.

  4. Click Save.