<From: >substitution in mailing lists?

Hello SuSE folkz, Could somebody tell me please how to substitute From: header content on something different when it's being sent through the mailing list. I'm using majordomo and sendmail. Generally I want to achieve this: When mailing list recipient is getting mail from the list he/she should see in the header the mailing list name and e-mail address but not the name and address of the sender. Thank you very much in advance. Alex