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Getting undeliverable return messages looks like someone is spoofing my email for the purpose of SPAM

Getting the followign message and would like to terminate the ability of anyone to use our domain name without authorization:

Your message did not reach some or all of the intended recipients.

      Subject:      Re: 433 VtAGGvRA
      Sent:      5/31/2006 5:14 PM

The following recipient(s) could not be reached:

      johnsmithsvt@strictlyaccounting.com on 5/31/2006 5:14 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.
            <strictlyaccounting.com #5.1.1>

Any suggestions?
1 Solution
Make sure your SMTP doesn't have open relay.
ddevin1Author Commented:
alright someone may just be spoofing my return address

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