Yet another surprise from Cloudatcost

Cloudatcost, the canadian cheap & flat cloud VPS provider (partner of @Fibernetics) seems to have really serious problems on the devops side. I already talked here about their infamous backdoor user (“wikus”) on their Debian 8 x64 VPS images (this seems to be solved by now).
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Common Zimbra outgoing mail issues behind NAT

Setup Zimbra Collaboration Suite on a cloud server without public interface (read: behind NAT) may waste you an afternoon trying to figure out why local emails (same domain) are not delivered, while sending/receiving mail from/to the internet works flawless.
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