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Hi belia,
Sounds like quite a dilemma.
I can recommend a good and helpful ISP provider.
http://stormwire.com They provide stellar service at a low cost (but not the cheapest... )
One thing you might be able to do on your own is shutdown or change your email sending function from Xoops; you might also try changing (deleting?) the host email account you use to send email (the one loaded into the XOOPS send email function).
That's about all I can think of...
Pax vobiscum,
...mark
may the road rise to meet your feet!
http://treemagic.org