The last qmail server I built (NOT from Toaster), the
email will be bounced back to the sender if there is
no such email account. And the bounce message size
will be truncated to the specified size (you can
specify the size, e.g. 10K).
With toaster there is chkusr patch on toaster that rejects 'no such email accounts' on smtp level, that does _not_ produce bounce message.
-- Eero
