Through the kind courtesy of John, KI5D, mailman.ampr.org has a new home, on a virtual host in Fremont Calif. It is now at IP address 199.249.223.193, and has a revised SPF record. This should significantly reduce the spam filtering problems we've been having. The hostname and web URLs have not changed.
Because of long times-to-live in the ampr.org DNS tables (1 day), your mailer may still attempt to connect to the old address of 44.0.0.1 if you send mail to the 44net@mailman.ampr.org or 44-announce@mailman.ampr.org mailing lists. It's been about 12 hours since the address change, so about half of the cache entries people may have should have expired by now, but some will not have yet.
I've reduced the TTL on ampr.org DNS records to 1 hour from the previous 1 day to help prevent this sort of long cache delay from occuring in the future.
If you send mail to the 44net or 44-announce mailing lists and the connection is refused, you have the old address still and your mail should be delivered on some subsequent retry when that entry has expired. Or you might be able to flush the DNS cache on your mail host and retry for faster delivery.
Similarly, if your web browser has the old address in its cache, you will get a 404 error attempting to access the mailman web interface. Flush the cache or wait.
Thanks John! - Brian
Seems there were a few configuration bugs to work out; I apologize if anyone got more than one copy of the new-host/IP-address announcement. Should be better now. - Brian