On Tue, 2002-06-11 at 07:42, Armin Fuerst wrote:
> 
> I entered the dsbl / ordb - blacklist as an "Other DNS-based blacklist",
> and it is generally working - with a big "BUT":
> The messages are filtered, but the sender doesn't get an error-message, so
> he assumes the mail was sent/received.

That's neither the intent, nor my experience.  When you use courier's
MTA with the dns blacklist feature, the SMTP server waits for the MAIL
TO: command from servers which are blacklisted, and then returns a fatal
error.  It is the responsibility of the server sending mail to you to
inform its users that there was an error.  The only time I did not see
this happen correctly was with MS Exchange server.  It *would* tell the
sender that there was an error, but it would give its own "guess" as to
what the error was, rather than returning the very helpful text of the
error message from the Courier SMTP server.

What mail server software are your senders using?



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