I keep getting MyDoom mails - a couple everyday. This is no problem as I recognise the 31 kb files and delete them without opening. However, now I also keep getting mail server replies from various domains saying that mails I have sent have been deleted as they carry MyDoom or Novarg attachments. I recognise none of the e-mail addresses that I allegedly sent mails to, and my sent mail file does not show these mails...in fact I did not send these mails. Does anyone know what is going on? Is this something I should be worried about?