Hello I was wondering if anyone can give me some recommendations on how to stop our Exchange server queue filling up with NDR emails and maybe some best practices when it comes to spam.
Our environment is this. We have domains hosted on a godaddy server and the mail is forwarded to our office through our cisco asa 5505 firewall to our SBS 2003 Server with Exchange. Our antispam engine is Bitdefender.
Usually about a couple days a week we'll get emails sent to our server for a non existing email address then our email will try to send an NDR but of course the address/ip is spoofed so they all get stuck in the queue. That's an NDR attack right? I know this sounds like a stupid question but should I just disable Allow non-delivery reports? My main concern is that legitimate mail might come in with maybe the wrong address (mistyped) and not send an NDR to that person. So it seems that there might be a lot of assuming going on when it comes to getting emails or not. Any suggestions would be appreciated. And awarded points if it fixes my problem. Thanks