Why won't Mail under Exchange send large attachments?

I upgraded my new iMac to Snow Leopard in large part because of its support for connecting to Exchange 2007 servers, which I use for my work. But I can't send attachments of any size.
Setting it up in Mail seemed to go fine - I connect using a software VPN and am able to read emails - and also send emails via the Exchange server, but only if they're small - under 1MB, really. Anything bigger and they just won't send - the wheel by 'Sent' just spins and spins. My work IT helpdesk weren't much help - they just said this was a 'known issue' with Snow Leopard that they couldn't address. It doesn't appear to have been fixed by 10.6.2.
What's going on here? It's clearly not a problem with email size limits on my work mail server, as I can use the webmail interface perfectly well, and also send emails from Outlook on my work PC, via the Exchange server. My other POP accounts set up in Mail also work fine.
Any ideas? Thanks in advance.
Sam

Frederick Koiwai wrote:
It use to, even if I had a lot more addresses ... but now it won't. I keep trimming out how many recipients/friends I have, but to no avail.
Maybe your ISP has put a limit on the number of addresses per email in an effort to reduce spam. Or maybe you have an invalid address in the list and your email client aborts sending the email.

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