>to something like: > >From: Brian E Carpenter <brian.e.carpenter@xxxxxxxxx.INVALID> That's what I do on my lists. It was pretty easy to add in the shim that adds the outgoing DKIM signature, and is the least painful thing I could think of for my mostly non-technical users. >(or maybe instead of yahoo.com.INVALID, it should be "yahoo.com.BREAKS.MAILING.LISTS" Now, now, there's no LISTS TLD. Yet. R's, John