> -----Original Message----- > From: owner-postfix-us...@postfix.org > [mailto:owner-postfix-us...@postfix.org] On Behalf Of Wietse Venema > Sent: Tuesday, November 22, 2011 2:23 PM > To: Postfix users > Subject: Re: Postfix and MIMEdefang; per-recipient treatment of messages in a > milter environment > > This is not reliable. If one recipient mail transaction fails (no disk > space or whatever) then you must report a tempfail error to the remote > SMTP client. Later, the SMTP client will send the whole message again, > WITH THE THE SAME RECIPIENTS AS BEFORE. In other words, if one > recipient transaction fails, other recipients will receive an extra > copy of the message.
Or you return DSNs for the ones that fail after 250ing the incoming transaction. But that has its own issues, e.g., backscatter. It's a shame http://tools.ietf.org/id/draft-hall-prdr-00.txt or something like it never went anywhere.
