Hi,
Did you get anywhere with this? I'm having the same problem - random messages being forwarded mainly to other 'in-house' email addresses or regular recipients.
Was wondering whether it might be a virus. Would be really grateful if you could let me know if/how you solved the problem...
I'm sure that there's something simple that I'm doing wrong but I've been stuck all day on this.
I've just bought a new Powerbook Pro. I took it straight out of the box, loaded my data from our old Mac and went away for a week. While I was staying in a hotel, it happily downloaded my mail...