RE: can a virus do this?

  • From: "David Liles" <dliles@xxxxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Tue, 19 Aug 2003 15:34:40 -0400

To the best of my knowledge, there shouldn't be any relaying.....
The email account that is erroring is on our exchange server so nothing should 
be passing through our SMTP service. Our server is the end point in the 
process.... I'm currently using an external email account to test by sending an 
email to my account on our new exchange server.
If we need to specify external domains that can relay just so we can receive 
email it seems we would be turnning ourself into an open relay....

        -----Original Message----- 
        From: Craig Haywood [mailto:craig@xxxxxxxxxxxxxx] 
        Sent: Tue 8/19/2003 3:29 PM 
        To: [ExchangeList] 
        Subject: [exchangelist] RE: can a virus do this?
        I take it, when you send mail internally, you have the option to relay 
for authenticated users ticked. However, external users don't authenticate. On 
your internet mail smtp connector, you need to specify domains which may relay 
through your server.
        Hope this helps


        From: David Liles [mailto:dliles@xxxxxxxxxxxx] 
        Sent: 19 August 2003 08:52 PM
        To: [ExchangeList]
        Subject: [exchangelist] can a virus do this?
        Can a virus cause this?
        We have one Exchange 2000 server we are trying to replace that is 
currently exposed (public IP - this is bad... we know).
        We have just added a new Exchange 2000 server that is on a private IP 
and behind an MS ISA firewall only box.
        We have only migrated a couple of email accounts from the old Exchange 
server to the new one for testing and are experiencing problems when sending to 
those accounts.
        We can send internally to any email account without problem, as well as 
send mail externally without problem.
        We are unable to send mail to any of the users that we migrated to the 
new Exchange server from an external email account (fyi... this email address 
is external), when we try we get the following error:
        Your message did not reach some or all of the intended recipients. 
          Subject: FW: Welcome to the Discussion List 
          Sent: 8/19/2003 9:33 AM 
        The following recipient(s) could not be reached: 
          dave@xxxxxxxxxxxxxxxxxxx on 8/19/2003 9:33 AM
          You do not have permission to send to this recipient. For assistance, 
contact your system administrator.
          < #5.7.1 smtp;550 5.7.1 Unable to relay for 
        ISA configuration:
        We have published our Exchange server using the Secure Mail Server 
publishing wizard.
        Users are able to access the internet.
        Protocol Rules allow for DNS Query and DNS Zone Transfers and SMTP to 
travel out
        IP Packet Filters configured for SMTP inbound and SMTP outboud 
(individual filter entries)
        Other configuration info:
        The Exchange server has a private IP and is configured with DNS 
        The NIC DNS entry points to itself and the DNS service is configured to 
forward to our ISP's DNS server.
        The default gate way is the private IP of the ISA box.
        The recipient policy used for the user accounts having problems is the 
default for our domain.
        Any ideas why we are having his problem?
        Thanks - Dave

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