All recipients[1], or only "valid" recipients[2]?? [1] Makes sense if the mail is NOT delivered. Examples of that are spamtraps or honeypots.
Yes, that is the case here - honeypots/spamtraps.
[2] Requires that the Postfix SMTP server can figure out what addresses are valid. Otherwise, you will become a backscatter source.
Alright, so basically it is not really a postfix-question?
