It seems that i am sending out massive amounts of spam on my SBS2003 server. The spam sender seems to be from postmaster@"mydomain".com or email@example.com and the recipients are all different.
How I found out that I had a problem: I have a dynamic Ip address so I use a mail relay service from tzo.com that allows me to send email. Tzo has a cap on the amount of emails that I can send (2000) per month. Tzo notified me that I had exceeded that amount already this month. So, I am monitoring the connector queue in Exchange that forwards my mail to Tzo and that I see the postmaster@"mydomain".com or firstname.lastname@example.org emails being submitted to the queue.
I have disabled my outgoing mail on exchange. I noticed a folder called masssender in c:\program files\ which I deleted. I am still generating emails. HELP ! Thanks