With Postmaster authority, submit a command like this to the LISTSERV(tm) site in question:

   change * [log in to unmask] [log in to unmask] 

I may have that slightly wrong, typing off the top of my head, but it's in the documentation.  Wildcards are permitted too, so you could change *@old.isp.com *@new.isp.com as well, if need be.  Or things like *@email.service.com to *@service.com work also.

>>> [log in to unmask] 05/05/03 12:00PM >>>
Hi all,

Do you know how I can change user's mailing address for all the lists?

Thanks in advance!
Eric