Unfortunately, I''ve had to get used to the fact that I recieve about 30 items of spam a day, ranging from V*agra + cial*s adverts to obvious phishing scams etc. Outlook express will identify most of these a spam and I've set a rule for them to be deleted, however, over the last few days or so the spam count has increased and I'm getting a lot of 'undelivered mail' notices for e-mails which I have not sent, the senders e-mail being similar, but not the same as mine. Has anyone encountered the same problem, and more importantly, discovered how to solve it?
Also consider using Thunderbird instead of Outlook Express. It works just the same, but has a bayesian spam filter that learns as you report spam, so can often spot new spam like you can. It's free.