Panix.com domainjacked
Someone has hijacked the panix.com domain name in such a way that all mail to panix.com addresses is being redirected to somewhere else. I'm quoting the following from the panix.com web page (which I can still reach for the moment, but I gather most people can't); for most panix users, the last paragraph is the most important one.
Panix's main domain name, panix.com, has been hijacked by parties unknown. The ownership of panix.com was moved to a company in Australia, the actual DNS records were moved to a company in the United Kingdom, and panix.com's mail has been redirected to yet another company in Canada. Panix staff are currently working around the clock to recover our domain, but this may take until Monday, due to the time differences and difficulties in reaching responsible parties over the weekend.
For most customers, accesses to Panix using the panix.com domain will not work or will end up at a false site.
As a temporary workaround, you can use the panix.net domain in place of panix.com. In other words, if you're trying to log onto "shell.panix.com" or see your mail at "mail.panix.com," use "shell.panix.net" or "mail.panix.net" instead. However, you should only change the names of hosts that you connect to or your return address: the name you use to login to our mail servers, username@panix.com, should stay the same.
Mail to username@panix.com is currently being redirected to the false site, and should be considered lost or compromised if it does not arrive in your Panix mailbox.
Note, for example, that email to Patrick and Teresa Nielsen Hayden to their panix addresses probably won't go through (see an Electrolite entry for alternative addresses); likewise Beth Meacham.
For more details, including a lot of technical info, see the Slashdot article. Note that it appears Panix didn't do anything wrong here—their domain registration was paid up and so on—but they're having a very hard time convincing the registrar that there's a problem.
(Thanks for the info, Chaos!)