D G Teed: > In your opinion. In our practical situation, it would be a benefit > if there was flexibility, and we could decide how postfix > treats "no DNS reply".
In my real-world experience, there are brief network outages all the time. It would be really bad if all mail were returned as undeliverable, just because some router was clogged up for a minute. As discussed on this list, you can configure Postfix to make exceptions for specific domains. However it is a mistake to handle "no DNS reply" as "host does not exist" for the general case. Wietse