By default, the Spam filters here work like this.
Each piece of eMail is scanned and if suspected to be spam, it's probability of being spam is graded as Low, Medium and High.
eMail with a Low probability of being spam has 'SPAM-LOW' appended to the subject line and the email is then delivered to the recipients mailbox. The eMail is otherwise unaltered.
eMail with a Medium or High probability of being spam is placed in the users ONLINE Junk E-Mail folder.
NOTE: This mail IS NOT DELIVERED TO YOU when you check your eMail with Outlook, Safari, Eudora (or any other POP3 email client)
To retrieve mail from your Online Junk E-Mail folder, see this article:
http://support.realwebs.com/KB/a22/how-to-download-the-mail-in-junk-e-mail-folder.aspx
To change the way Spam is processed for your account:
From the Settings drop down menu, select My Spam Filtering
Click the 'Override spam settings for this account (the Default Settings display will disappear).
Click the Actions tab. (You will not be able to select this tab if Use default spam settings is selected above)
The Actions tab will allow you to choose what action to take on any suspected spam.
The choices should be self-explanatory. Note that Delete message and Move to Junk E-Mail folder messages will never arrive on your desktop.
To prevent spam checks on an individual or an entire domain, add them to your Trusted Senders list.
Click the Trusted Senders tab.
After making your changes, click Save.
If you, as domain administrator, would like to create domain wide default settings, see this article:
http://support.realwebs.com/KB/a17/how-to-spam-filtering-domain-level.aspx