Webmail
If an email has been sent to an Exchange email list that you are a moderator for you will receive an email asking you to reject or approve the email by clicking on the "Reject" or "Approve" buttons in the top left corner of the email.

Outlook 2007 & 2010
If an email has been sent to an Exchange email list that you are a moderator for you will receive an email asking you to reject or approve the email by clicking on the "Reject" or "Approve" buttons in the top left corner of the email.

Outlook 2011 for Mac, Thunderbird, Apple Mail
If you are a moderator for a campus mailing list and use one of the above email clients you will need to use webmail to "Approve" or "Reject" the message for your list.
If you are the owner of an Exchange email list, you can now add and remove users to the list using Webmail instead of Mailman.
To manage a list membership, log into Webmail as yourself and click on "Options".

Select "See All Options"

Select "Groups" and double-click on the mail list you would like to manage under "Public Groups I Own".

Select "Membership" and you can add or remove users from the list.

"Save" the changes.