Re: CDONTS sends internally but not externally

From: McKirahan (News_at_McKirahan.com)
Date: 10/08/04

  • Next message: Tom Kaminski [MVP]: "Re: ASP Question" 
    Date: Fri, 08 Oct 2004 11:17:13 GMT

    "Adam" <adam.hearne@yourinsurance.co.uk> wrote in message
    news:da223d5.0410080248.321d1741@posting.google.com...
    > Hi guys,
    >
    > We are connecting to a windows 2000 exchange server and using it to
    > relay emails sent from an ASP page. The IIS server which hosts the
    > ASP page is using its own SMTP virtual server to relay the email to
    > our exchange server via it being specified as the smart host. The
    > whole process works like it should when the recipient is internal.
    > The problem arises when the recipient is external. We get an instant
    > 'undeliverable' message sent back from System Administrator for all
    > the external email addresses we tried to relay through the exchange
    > server. After looking at the email header on these 'Undeliverable'
    > messages, I hope I am about to cut and paste the relevant part from it
    > that helps identify where the problem lies:
    >
    > Received: from IIS_server.internaldomain.co.uk ([192.168.0.18]) by
    > exchange_server.internaldomain.co.uk with Microsoft
    > SMTPSVC(5.0.2195.5329);
    > Fri, 8 Oct 2004 10:08:01 +0100
    > From: postmaster@IIS_server.internaldomain.co.uk
    > To: adam.hearne@internaldomain.co.uk
    >
    > So after looking at this...is it safe to say the IIS_server is
    > generating the error response because exchange_server won't let it
    > relay the email through???
    > If so, how do I fix this??
    >
    >
    > I have discovered a mediocre work around which is: Go to the
    > IIS_server's SMTP virtual server and add a 'New Remote Domain'. If I
    > specify the new remote domain as '*.com' i will then have the ability
    > to successfully relay emails to any external address ending in that
    > suffix (e.g. someone@hotmail.com would actually work!). But you can
    > see I would then have to make a similar entry for every domain we
    > wanted to send emails to.
    >
    >
    >
    > I have looked at Microsoft KB article #293800 'How to set up windows
    > 2000 as a SMTP relay server or smart host'
    > (http://support.microsoft.com/default.aspx?scid=kb;en-us;293800). I
    > have cut and paste the section which I thought would fix this problem
    > and have implemented accordingly:
    >
    > "Step 3: Specify the Hosts That You Want to Openly Relay to All
    > Domains
    > Note: Anyone can send to the domains that you specified in Step 2.
    >
    > This step is for hosts, which are most likely your internal servers
    > that would need to send to all domains on the Internet. It is not
    > recommended to not have any restrictions because anyone can use your
    > server as an open relay. It is recommended to only allow the minimum,
    > necessary hosts to openly relay to all domains. To do so:
    > Open the properties of the Default SMTP Virtual Server.
    > On the Access tab, click Relay.
    > Click Only the list below, click Add, and then add the hosts that need
    > to use this SMTP host to send email. On the dialog box that appears,
    > you have the following options:
    > Single computer: Specify one particular host that you want to relay
    > off of this server. If you click the DNS Lookup button, you can lookup
    > an IP address of a specific host.
    > Group of computers: Specify a base IP address for the computers that
    > you want to relay. You have to specify the octets in the IP address
    > for hosts that you will allow to relay. For example: If the IP address
    > is 192.68.7.21, and you want any hosts with the first two octets
    > 192.68 to relay, specify 255.255.0.0 for the subnet mask.
    > Domain: Select all of the computers in a domain by domain name that
    > will openly relay. This option adds processing overhead, and might
    > reduce the SMTP service performance because it includes reverse DNS
    > lookups on all IP addresses that try to relay to verify their domain
    > name.
    > Configure the other servers to use your relay server as a smart host
    > Depending on the other applications or mailers that will use your
    > relay server, you may have a option where you can specify a smart host
    > or SMTP relay. With Exchange 2000, you would create an SMTP connector
    > and specify the Windows 2000 Relay server in the Forward all mail
    > through this connector to the following smart host box. "

    Please do not cross-post!

    microsoft.public.inetserver.iis.activeserverpages
    smtp relay to internal ok but not external!

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