We are running an application which pulls mail from yahoo pop3 server and ultimately resends it, via local postfix server, keeping the same from and to addresses. The way I see it, there are rare instances where from domain requires strict dkim enforcement. As a result, yahoo rejects it notifying this postfix server. This postfix server attempts to notify the original sender with ndr. But they claim the mail was not sent from their smtp server. Clearly, I don't want to send ndr to the original from. address. Would this be a good candidate for Anti Backscatter postfix configuration?
If yes, I am not quite clear on the following,.. There is an entry for header and body checks. It seems that both have to be to true for the mail to be rejected. For instance, the ndr should be going to any domain other than my domain and the body has to be structured as ndr. How would I specify that? Thanks
