Yes, you can create filters on your email account.

If you are using Internet Explorer, login to the new Outlook Webmail (https://outlook.wabash.edu). Please click on "Rules" > New > enter a Rule Name > Where the...contains: (enter text that matches the criteria for what you would like to block) > "Then" > you may choose to "Move it to:" or "Delete it" > click on the "Save and Close" button.

If you prefer to use Firefox, you may login to the new Outlook Webmail (https://outlook.wabash.edu) > Click on "Options" > scroll down to "Privacy and Junk E-mail Prevention" > click on the "Manage Junk E-mail Lists..." button > scroll down to "Blocked Senders" section and enter the e-mail address or domain names of those you wish to block > click the "Add..." button > click on the "Save and Close" button.

If you are using the old Webmail (http://webmail.wabash.edu), choose "Options" (top menu bar), and then "Message Filters" > Click "New" > Filter the messages based on the requirements you would like. (example: Match: From  - Contains: xxx -  Move to: Trash)

Another option, you may login to Postini (https://login.postini.com/). Your username here is your full email address > Click on "Junk Email Settings" > Leave the Junk Email Blocking "ON". Below that, in the "Spam Filters" section, you may increase the settings to "Aggressive" and/or add the sender's address to the "Blocked Senders" list.