discarding mail during smtp session

Igor Belikov <[email protected]> Tue, 22 Feb 2005 14:06:09 +0000 (UTC)

Newsgroups	gmane.mail.exim.exiscan.user
Message-ID	<[email protected]>

  Is it correct to reject mail (with 550 error) during SMTP?

  Are all MTAs understand 550 error and stop trying to send same
  letter more and more times?