I'm currently using Mercury to service my lists. (I've ben discussing this problem with its author and other advisers for some time.) It does a good job, although not nearly as full featured as listserv (but, it's also free). One never ending problem for me, though, is its reliance on an errors-to header to direct bounce messages. Most of the error messages end up going back to the subscriber who submitted the message. They don't appreciate getting 10 bounces (AOL is down, full mailbox, unknown user, etc.) for every message submitted. Looking at the full header from this list I see a return-path header that doesn't exist in my Mercury messages. Is this how listserv protects the user from error messages? If so, is its location within the header important (i.e., should it be at the top of the header)? Thanks. Larry Stephens ([log in to unmask]) Indiana University Office of Risk Management 400 E. 7th Room 705, Bloomington, IN 47405 812-855-9758