Stop updating dns record
You will need to look at the header from one of the spam emails.
Look for the very last line that starts with Your DV can be set up to accept messages only from senders that can pass varying degrees of SPF verification.
While the SPF record is not 100% effective, because not all mail providers check for it, you should notice a drastic decrease in the amount of bouncebacks you receive.
If you are also receiving the original spoofed emails (that look like spam coming from yourself) you can add the spammer to your block list.
Adding an SPF record to your zone file is the best way to stop spammers from using this technique with your domain.
An SPF record will eliminate a high proportion of the bouncebacks you've been getting, because other mail providers will reject the email immediately without sending a bounceback to the (spoofed) reply-to address.
If you are using Google Apps for your domain, please see the following guide at Spamming with a fake reply-to address (yours) is called "spoofing." Since the email appears to be coming from your server, complaints and bouncebacks from the spam will often be redirected to your server, rather than the actual spammer.
You may also receive some of the original spam - spam that appears to be coming from you!
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Therefore, that means none of your Windows computers have been configured with a Primary DNS Suffix.
Sender Policy Framework (SPF) is a method of fighting spam.
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