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I'll be moving the MAC server to new hosting shortly, it looks like Thursday or Friday AM. During this time the DNS records will be moving too, so you will likely lose access to the site for a few hours, and up to one day. We have had issue with e-mail from the start on this current host, and are moving to one that is known to lack these problems.
FYI. I'll post again when I confirm which day it will be.