Hello iantresman,
Thank you for your post.
Please note that backscatter would not be a reason for your IP getting listed on any reputation list.
That said, you should be able to recognize backscattered emails as NDR (Non Delivery Report) messages in the logs, for messages that are being sent back to your customers as spammers are spoofing your customer's email address to invoke backscattering.
Also, messages should be a response from the server/email address that your customer has not emailed previously,
If the backscatter is caused due to email forwarding to remote servers, we would recommend removing forwards, especially because forwarding does not work well due to most of the senders now use SPF, which we suspect might be the main reason for your IP being listed on SpamHaus.
Alternatively, we would be happy to assist you with strengthening your MagicSpam anti-spam protection so that spam emails are blocked fully before being forwarded to remote servers. If you need such assistance, please contact our MagicSpam support team at:
support@magicspam.com and provide screenshots of the following tabs in your MagicSpam:
* Anti-Spam / Spam Policies
* Anti-Spam / IP Reputation
and our team would be more than happy to assist you.
We hope this information helps.