Brad and Mark,
Thanks for your responses!
Brad,
Display this where?
My goal is to hide the sender's email address, in all places, to prevent harvest by spammers.
Mark,
You can make your list anonymous (anonymous_list = Yes on the General Options page) which puts the list rather than the sender in From:, etc. headers. Then posters can sign their posts and provide as much or as little info as they want.
I like this option.
However, if you're really concerned about hiding e-mail addresses in any of these cases, you'd also have to do something about Received: headers in incoming posts as they can reveal things like the IP address, domain and in some cases even the address of the sender.
Even with the anonymous function? You may not be the right person to address this question to, but I can't help but wonder why a program like MailMan couldn't simply create a new email and copy only subject and body. The email would be from the MailMan program and only have Received headers created in its transit from the MailMan server to list recipients....
Douglas