Helping people with computers... one answer at a time.
There are a couple things to investigate if your computer is trying to automatically send emails.
Every so often an email is automatically sent via Outlook express to a certain address, which I am not familiar with, having my windows user-name as the subject. This happens every time I turn my pc on and sometimes as I'm using it; always to the same yahoo address. Sometimes symantec gives me an error message because my mail server would be down as it's trying to be sent. I can't find anything that might be it in msconfig/startup. Is there any way I can stop this from happening? Can I configure outlook express to not send emails to certain address, or have symantec not allow the emails to be sent, or best of all: find the program and permanently remove it? I run adaware pro at least twice a week, and it comes up clean.
Sounds very spooky. There's nothing obvious that really comes to mind, but I do have some ideas to try.
I'm not sure if you could add an entry to your address book that would cause emails to the address in question to fail or not. That might be a bandaid to try.