Just checked my mail. Seems like their mail system is rejecting messages to one of the addresses listed on their web page:
<dibittner@stouffer.net>: host mail.stouffer.net[64.255.101.224] said: 550
unknown user <dibittner@stouffer.net> (in reply to RCPT TO command)
Reporting-MTA: dns; hiddenworld.net
X-Postfix-Queue-ID: B33E3315CE
X-Postfix-Sender: rfc822;
dilcher@hiddenworld.net
Arrival-Date: Fri, 4 Feb 2005 00:13:27 -0500 (EST)
Final-Recipient: rfc822;
dibittner@stouffer.net
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host mail.stouffer.net[64.255.101.224] said: 550
unknown user <dibittner@stouffer.net> (in reply to RCPT TO command)