Phew! Thanks for all this BEagle, I agree 100% with your comments re: the VMC blurb.
One word of warning. Although Vodafone point out that there are additional charges when connecting to an overseas partner service provider, I only recently found out how much these charges were. Believe it or not I was charged just over £50 for less than 2 Mb of email traffic when in France recently, on top of the normal monthly subscription to Vodafone.
I've just downloaded and got postcastserver working on my main PC and it seem to work like a dream. I'll try porting it to the laptop tomorrow and see if it works with the VMC card. If it does, then I'll post details back on here, as it's an even simpler fix than selectively using send and receive from two accounts. Thanks for the tip on this little program maxell, a good bit of advice.