Can anyone tell me if MS Exchange 2003 has the ability to discard connections when a PTR record is not present for the sendee. IE if an email is sent from a domain that only has an MX record and not a reverse public record aswell that email would not be delivered and an NDR delivered instead indicating to the sendee that the "said" domain does not accept email from domains with no valid PTR record. I know exchange has the ability to do a reverse look up on the SMTP connector. But this only allows for reverse DNS information to be appended to the message headers which in my opinion is a bit of a useless feature and a possible uneccesary over head on your mail server. Finally assuming exchange doesnt have this feature (which im pretty sure of) is there any open source utility that can be integrated into exchange to allow for this feature.. (why o why is SMTP inherently insecure. Maybe we need a new ratified protocol that can allow for securer SMTP connections.. ok im rambling now..)
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