Hello, I just upgraded from Exim version 3.*+ to Exim 4.2. I had SmartList working on fine on Exim 3.*+, but after upgrading, SmartList IS sending out email, but we are getting tons of emails coming back like this: Subject: Mail delivery failed: returning message to sender This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients. This is a permanent error. The following address(es) failed: Laura@Care2Learn.com unrouteable mail domain "care2learn.com" tebanks01@msn.com unrouteable mail domain "msn.com" carolyn34474@msn.com It will deliver to some domains, but not others like msn.com or yahoo.com, etc.... There is an FAQ out there about how to get SmartList working with Exim 3.* and that's how it I got it working in the first place, but I can't find anything about getting it to work with Exim 4.2. Any help would be greatly appeciated!!! This is what I used to have in the Directors Section: list_director_slist: driver = smartuser suffix = -request suffix_optional local_parts = !.bin:!.etc require_files = /home/slist/${local_part}/rc.init transport = list_transport_slist I changed it to the following, because Exim 4 doesn't like the driver = smartuser, or the suffix, and suffix_optional options: list_director_slist: driver = accept local_part_suffix = -request local_part_suffix_optional local_parts = !.bin:!.etc require_files = /home/slist/${local_part}/rc.init transport = list_transport_slist I put that in the Router Section. Any suggestions??? Please help!!! Best Regards, Chad R. chadroad@cox.net