Courier seems to expand all external addresses in aliases so that the DSN value is set to "NEVER" (NN in the control file). It'll then deliver the message to the external address with either an empty return path, or NOTIFY=NEVER, depending on whether or not the remote server supports the DSN extension.

Is this desirable? What if the destination is an alias on a remote server? Will that not prevent users from seeing delivery failures that occur after the first hop?



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