I am able to access them both at work and home.
Trying 66.7.200.85...
Connected to pass66.dizinc.com (66.7.200.85).
Escape character is '^]'.
220-pass66.dizinc.com ESMTP Exim 4.52 #1 Fri, 03 Nov 2006 14:58:46 -0500
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
But since Tom sees the same issue - this is really strange for those 2 servers.
Still checking into it.