So long as you are using GroupWise email and keep your Command AntiVirus software updated you should be protected from viruses in email attachments. Many viruses send themselves to people in the victim's address book without their knowlege.
Some antivirus programs can only detect viruses if a file is saved first and then opened.
Call the person who sent it to you and confirm they meant to send you an attachment. If they did not send you one on purpose, delete the email. If they did send you an attachment, DO NOT OPEN the attachment, View the attachment using the GroupWise Viewer. If you are not using GroupWise, save the attachment and follow steps 6 and 7. Scan your computer or the folder the file is in with your anti virus software.