This might be good... I download my email from several webmail accounts (Yahoo UK and laposte.net) into Outlook Express. However, though it all comes down perfectly, I can't reply to the mails. When I try to send a reply using the account it came 'into', I get a message saying 'relaying is not allowed'.
Googling reveals that it's a common problem... but the only solutions i can fins are to do with making sure the smtp addresses etc are correctly entered. Which they are. And I receive mail OK, it's just sending it back! *head spins*