I am saying that there is a bounce/response code generated
"bounce" is what an MTA experience when its attempt to deliver fails.
"reject" is that an MTA does when it refuses to accept a msg in the SMTP dialog.
to say that the message was rejected by some aspect of the filtering process.
The 4xx/5xx numeric response code can have optional text that the rejected MTA should return to the envelope sender. This is the preferred behavior that avoids "delivery failure msgs", aka backscattter, by the rejecting MTA, going back to innocent senders.
When your MTA, Imail, accepts a msg, and THEN decides it's not deliverable (or otherwise inacceptable), then Imail must generate a new "delivery failure msg" to the envelope sender (very often forged, existing real or not). This is the wrong behavior in today's Internet, due to the predominance of forged senders.
Len
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