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["Roger B.A. Klorese" <address@concealed>]

 On 8/26/10 8:15 AM, Bastien ROUCARIES wrote:
> On Thu, Aug 26, 2010 at 4:01 PM, Roger B.A. Klorese<address@concealed>  
> wrote:
> >   Just checking -- does this properly reject, rather than bounce,
> > undeliverable messages to the target domains?
> What do you call reject ?

Rejecting is when, during the original SMTP conversation with the 
sending domain's MTA, you do not accept the mail if the list, -owner 
address, -subscribe address, etc. does not exist.

Bouncing is when you accept the message into your queue, then 
subsequently send a DSN when you try to process it in your queue and 
can't deliver it.

Rejection is better than bouncing because it is not prone to produce 
backscatter -- where the message itself has a forged sender address, so 
you spam the alleged sender when you send the DSN.