DNS has been screwed up on this server for who knows how long. It seems to depend on what your ISP is, and how long its DNS server caches the records for outpostuniverse.net. (Currently it loads fine for me. A lot of the subdomains seem to have problems with this)
We don't really know what's going on with it (we've checked and rechecked the settings many times). Also we don't really have permission to directly adminster the DNS server.
As a precaution I've checked your DNS zone record. It looks to be perfectly fine.
Currently a solution I might suggest so you can access your site without problems is to add the following entries to your hosts file (on 9x/Me, the filename is C:\Windows\HOSTS, on NT/2k/XP it's C:\Windows\System32\Drivers\etc\hosts)
67.18.22.68 horus.outpostuniverse.net
67.18.22.68 www.horus.outpostuniverse.net
Create similar entries for any subdomains you have (for example 67.18.22.68 subdomain.horus.outpostuniverse.net, 67.18.22.68 www.subdomain.horus.outpostuniverse.net and so on)
Save the file and restart any web browsers you have (on 9x/Me it may even be necessary to reboot)
Hopefully that helps.