Posted 29 June 2007 - 11:44 AM
A lot of spam will masquerade itself as a Mailer-deamon, since these can by-pass your provider's spam filters. Your address may have been harvested from the internet, or more likely was taken from an address list on another person's infected computer. If you have performed anti-malware scans of your hard drive, and cannot find the E-mail in question either in your client or E-mail provider's "sent mail" box, then you can be reasonably confident you are not at fault.
Whereof one cannot speak, thereof one should be silent.