To mark a message as spam, select the message and click Spam from the Messages toolbar.
If a message is marked as spam and you think the message is incorrectly marked, mark the message as Not Spam by clicking Not Spam on the mail toolbar. All messages that are marked as spam are moved to a folder that the Administrator designates as spam folder.
Alternatively, you can also mark the message as not a spam from the context menu. To do this:
Right-click the message.
Select Mark from the context menu options.
Select As Not Spam.
The selected message is moved back into its designated folder (for example: Inbox).