I've spoken to support and they are going to contact Tiscali. It seems to be a temporary network problem at their end.
I'm not sure how whitelisting would help generally as it seems to be a problem to many servers and I would guess even the whole datacentre.
I know Tiscali is running a reduced support team this weekend so I'm not sure how quickly they'll be able to act on and resolve this problem. I think the more people report it to them though the higher it will go up their priority list.
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