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

Posted on 2006-05-31
Last Modified: 2010-03-06
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: 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.
            < #5.1.1>

Any suggestions?
Question by:ddevin1
    LVL 4

    Accepted Solution

    Make sure your SMTP doesn't have open relay.

    Author Comment

    alright someone may just be spoofing my return address

    Featured Post

    Too many email signature updates to deal with?

    Are you constantly visiting users’ desks making changes to email signatures? Feel like it’s taking up all of your time? Wish you could manage all signatures from one central location, easily design them and deploy them quickly to users? Well, there is an easy way!

    Join & Write a Comment

    Granting full access permission allows users to access mailboxes present in their database. By giving full access permission one can open and read the content of any mailbox but cannot send emails from that mailbox.
    We are happy to announce a brand new addition to our line of acclaimed email signature management products – CodeTwo Email Signatures for Office 365.
    To show how to create a transport rule in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Mail Flow >> Rules tab.:  To cr…
    To add imagery to an HTML email signature, you have two options available to you. You can either add a logo/image by embedding it directly into the signature or hosting it externally and linking to it. The vast majority of email clients display l…

    734 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    21 Experts available now in Live!

    Get 1:1 Help Now