There aren't any fixes that I can see on that bug report, it's scheduled for a fix the next milestone (i.e. version 5.x.x) of zimbra but that won't be until next year. I don't have any schedule for that.
You really need to beat your hosting provider round the head about this problem, he should contact Zimbra support for further information. He should also quote that bug number and your posts on this forum.
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Regards
Bill
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