sending from my email address, how to stop

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:
 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.

            < #5.1.1 SMTP; 550 5.1.1 User unknown>


how can I stop them?
Who is Participating?
gjutrasConnect With a Mentor Commented:
Unfortunately, there is nothing you can do here.  Someone is either sending this email to you on purpose in the hopes you'll open an attachment or someone just found your email address and is using it in the from field.  The odds are that no one is using your email to send, but that someone is just putting your email in the from field.  It's a technique spammers use.  They put real emails that aren't their own so they can't get traced but because they are real emails they get past some spam filters.
MaerosConnect With a Mentor Commented:
It is also important to note that real e-mail addresses can be "spoofed" (faked) unless it is authenticated by something such as SPF, SenderID, DomainKeys, and so forth:

(Wiki article with technical info on e-mail authentication)

Are you currently using any anti-spam solutions for your e-mail, such as anti-spam programs, blocklists, SCLs (spam confidence levels), an so forth?
zephyr_hex (Megan)Connect With a Mentor DeveloperCommented:
look at the email header to see where the email is coming from.  then report it to the ISP that is hosting the sender.

if you are unsure how to read the email headers, use something like to analyze the email  (go to the Report Spam tab).

it's possible that email is coming from your computer and then you're getting the rejection notice from a mail server... but it's also possible, as mentioned above, that the From is spoofed.  that's why you need to look at the email HEADER.  see the spamcop link for info about how to reveal the full email header.

if the email is indeed coming from your machine, it suggests that you have spyware or a virus.

if the email is coming from somewhere else, then report it and then block the sender based on key words in the email header (use a keyword that identifies the true sender of the email)
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