Team for Research in
Ubiquitous Secure Technology

Every time a user sends email, I need to approve it. Why?

The workgroup email lists are set up so that for a user to send email, they must be sending email from the email address that they have associated with their website account. If someone in the workgroup sends email from a different email address, then the workgroup admin needs to approve the message by hand. If you would like someone to be able to post from a different email account, go to the admin page for the mailing list, follow the privacy link and add them to the following section:
Addresses of members accepted for posting to this list
without implicit approval requirement. 
(See "Restrict ... to list members" for whether or 
not this is in addition to allowing posting by list members