I have a problem that emails are sent from my email as follows:
From: System Administrator
Sent: Friday, July 20, 2007 4:23 PM
Subject: Undeliverable: strawberry-blonde blood clot
Your message did not reach some or all of the intended recipients.
Subject: strawberry-blonde blood clot
Sent: 20/07/2007 5:11 PM
The following recipient(s) could not be reached:
firstname.lastname@example.org on 20/07/2007 4:20 PM
The e-mail account does not exist at the organization this message was sent to. Check the e-mail address, or contact the recipient directly to find out the correct address.
< cti106.citenet.net #5.1.1 SMTP; 550 5.1.1 User unknown>
how can I stop them?