NDR from spam

From: Clementius (anonymous_at_discussions.microsoft.com)
Date: 05/13/04 

Date: Thu, 13 May 2004 07:55:29 -0500

Hi,
We are getting a lot of spam to mailboxes that do not exist on our system.
As a response, Exchange tries to send NDRs. Because sender's addresses are
bogus, we end up with hundreds of SMTP queues with undeliverable NDRs.
Should we be concerned about this and if so, how can we work around this
issue? Thanks for your input.

Relevant Pages

  • Re: MS Exchange 5.5 NDRs (from MyDoom)
    ... Microsoft Exchange 5.5 sending so many NDRs that it is causing network ... Microsoft Exchange Server 5.5. ... Enabling 550 response to unknown users might enable an SMTP AUTH relay ...
    (NT-Bugtraq)
  • Re: Interesting Dilemma
    ... Thank you for the quick response. ... I have around 65 mailboxes I need to ... > the E2k3 server locally with the local IP addresses. ... > Run Microsoft Exchange Server Best Practices Analyzer Today ...
    (microsoft.public.exchange2000.admin)
  • NDR from spam
    ... We are getting a lot of spam to mailboxes that do not exist on our system. ... As a response, Exchange tries to send NDRs. ...
    (microsoft.public.exchange.setup)
  • Coexist Exchange 2000 & 2007, can access OWA from 2000 but not 2007
    ... Can you kindly ellaborate on what you said. ... How are you meant to migrate mailboxes to Exchange 2007 if they cannot access OWA externally? ... I am currently going through technet to setup Exchange 2007 and cannot find this information so far. ... Appreciate your response. ...
    (microsoft.public.exchange.setup)
  • Re: Exchange Server 2000 relay problem.
    ... These may be NDRs from spam. ... Block Open SMTP Relaying and Clean Up Exchange Server SMTP ...
    (microsoft.public.exchange.connectivity)