How do I send email to a group or Mailman email address in Outlook?
Group email addresses are treated exactly like regular email addresses when entering them into e-mail messages. (Please keep in mind that some email groups are restricted access.) If you are still unsuccessful in sending email to the group, contact firstname.lastname@example.org. For example, professors may send mail to all students in their classes, but students may not use such a group. If you should be authorized to use a list, but the mail is still rejected, check your e-mail and reply-to addresses. These addresses should be set to match your preferred email address.