Problems with Displaying HTML in a BTinternet Email account


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HI guys
Ive been having problems displaying HTML emails on a friends BTinternet account and i told him i would look in to it. I have tried another Btinternet account and that seems fine. i have also tried Hotmail,Yahoo, Tiscalli and GMail and they all seem to be OK. My friend is using Internet explorer 8 and the HTML is written in HTML 4.01 +RDFa 1.1 (that took a lot of working out haha) so have you got any suggestions as to why, on a seemingly ordinary computer it displays with Extra line spaces and with some line spaces missing. the info is a little sensitive so i cant post the code but the HTML is very simple.
for example
<p><br><span><Font><strong><table><td> that sort of thing

Thanks guys