Redtail's Zimbra platform utilizes a powerful spam filter to determine whether messages from specific addresses or domains should be added to your junk folder. Most filtering of unsolicited automated mail is handled by the spam filter before those mail messages reach your Inbox.
However, If you find a message in your Inbox that is spam, select the message, then right-click on the selected message. Within the right-click menu, select the Junk option followed by Block Sender within the Junk menu. As a result, the mail is moved to your Junk folder. This action helps to train the filter specifically for your account.
This action adds the email address to the Block messages list for your account that can be viewed and maintained within the webmail client. Email from these addresses will be treated as spam going forward. Additional information on this can be found here.
Sometimes a message can be marked as spam and placed within the junk folder that is not really spam. You should check your Junk folder periodically to ensure that you are not missing any messages. To move messages that should not be marked as spam from your Junk folder, simply right-click on the message, Select Junk within the right-click menu then select the Not Junk option from the Junk menu options.
This action adds the email address to the Allow messages list for your account that can be viewed and maintained within the webmail client. Email from these addresses will be delivered to your Inbox going forward. Additional information on this can be found here.
To empty the Junk folder, right-click the folder and choose the Empty Folder option from the right-click menu. In addition, the contents of the folder are automatically purged after an administration-configured number of days.