External subscribing is not working thru either the web interface or the list-subscribe@hostname.org method. There is no confirmation message being sent... I can subscribe locally thru email, can manually add addresses thru the admin interface, and can even send/receive list mail from any already-subscribed address with no problem.

I've looked thru the FAQ, the FAQ wizard, searched this lists' archives the best I can, and still cannot find anything similar enough to suggest a problem/fix.

I'm using Mailman 2.1.6rc4, Exim 3 on Debian GNU/Linux 3.

Any help/suggestions would be greatly appreciated. Thanks.