If you have email set up as IMAP using Outlook:
1. When you receive a spam message, drag the message into your junk mail folder.
2. This will create a rule in the spam filters to help reduce future messages that match this profile.
3. Please make sure to do this for every spam message you receive to continue to update and improve the spam filter rules.
If you have email set up as POP3 or use the web interface exclusively:
1. Sign In to your email account at mail.yourdomain.com
2. Check the desired spam message
3. Go to Action --> Mark as Spam
In most folders, choosing the Mark as Spam option will delete the message, and add it to a list of spam messages for better spam protection later. This type of spam filtering, where you actually "teach" the mail server what you consider unwanted email, is known as "Bayesian Filtering". It is to your benefit to mark spam rather than just deleting it, because it helps you and others on your mail server avoid that type of mail in the future. If a message is marked as spam and it should not have been, select the checkbox next to it and choose Unmark as Spam when viewing it in the Junk E-Mail folder (if available). Remember when viewing Junk E-mail, the default view will be plain text in order to prevent the unwanted loading of images.
Please remember that it can take up to 72 hours for the rule to be created that filters that message as spam. Also, spammers are constanlty updating their practices to avoid being caught in spam filters. Therefore, it is crucial that you continually mark messages as spam to keep up with the spammers updates.