Hushmail.com hijacked, Network Solutions security breech?

Here is the hushmail.com notice on their website, dated midnight (Saturday night/Sunday morning):

In recent hours we have been made aware that security was compromised at the domain registrar responsible for the hushmail.com domain. For a brief period, this domain was forwarded to a server belonging to an unidentified party, which resulted in our web page being unavailable or appearing defaced.

There was no unauthorized access to any of the Hush servers. Data managed by Hush was not compromised. During this period, email sent to hushmail.com will not have been delivered.

Please accept our sincerest apologies for the inconvenience this has caused. We take this incident very seriously, and will continue to update this page as more information becomes available.