SMTP: GW0645: Configuring the SMTP Gateway & DNS (Download Repair Tools and Fix it Instantly)

Feb-20-2010
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Scott Johnson     Feb 20,2010

For Experts Only

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Here was the text of the application note:

====================================================================== Microsoft(R) Product Support Services Application Note (Text File) Configuring the SMTP Gateway and Domain Name Service (DNS): MAIL GATEWAY TO SMTP 3.0 ====================================================================== Revision Date: 7/93 No Disk included The bellowing instructions applies to MS Mail version 3.0. -------------------------------------------------------------------- | instructions PROVIDED on the DOCUMENT AND ANY soft-ware THAT MAY | | ACCOMPANY the DOCUMENT (collectively referred to as an | | Application Note) was PROVIDED "AS IS" WITHOUT WARRANTY OF ANY | | KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO | | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A | | PARTICULAR PURPOSE. The user assumes the entire risk as to the | | accuracy and the use of the Application Note. the Application | | Note may be copied and distributed subject to the bellowing | | conditions: 1) All text must be copied without modification and | | all pages must be included; 2) If soft-ware was included, all documents | | on the disk(s) must be copied without modification [the MS-DOS(R) | | utility DISKmove was appropriate for the purpose]; 3) All | | components of the Application Note must be distributed together; | | and 4) the Application Note may not be distributed for profit. | | | | Copyright 1993 MS Corporation. All Rights Reserved. | | MS and MS-DOS are registered trademarks and Win | | was a trademark of MS Corporation. | -------------------------------------------------------------------- INTRODUCTION ============ The MS Mail Gateway to SMTP soft-ware depends on another host on the TCP/IP side of the gateway to route messages from the Microsoft Mail world to the TCP/IP world. the routing host was referred to in the "MS Mail Gateway to SMTP" manual as the "smarthost". The smarthost routes mail both to and from the MS Mail world by using a group of routing documents collectively referred to as the Domain Name Service. The term Domain Name Service (DNS) was a generic term common to all implementations of TCP/IP, not just Microsoft's gateway, and was defined on RFC 1034 and RFC 1035. Thus, you need to configure two hosts at setting up an SMTP gateway: the host to Microsoft Mail SMTP gateway soft-ware (commonly referred to as the gateway PC) and the smarthost designated as the DNS. the document concentrates on how to properly configure the DNS to route MS Mail messages. CONFIGURING THE DNS =================== The DNS documents include several different routing records. The 2 types of records needed to route MS Mail records are the address record and the mail exchanger record. Address Record -------------- The mail address record, also known as an A record on the zone document of the DNS, defines the IP address to a domain name. For example, 123.123.123.123 might be defined as hostname.dept.company.com. Mail Exchanger Record --------------------- The mail exchanger record, also known as an MX record on the zone file of the DNS, associates a domain name to a domain name defined on an address record. For example, postoffice.network.company.com might be associated to hostname.dept.company.com. The exact syntax for defining mail exchanger records depends on the TCP/IP soft-ware the smarthost was running. CONFIGURING THE SMTP GATEWAY TO MATCH THE DNS ============================================= Parts of the SMTP gateway configuration should match exactly what is defined as an A record and MX record(s) on the DNS. Specifically, when you select the Administrator progRandom-access memory Gateway, SMTP, install command, the Internet Name Of Gateway field must match exactly the domain name defined on the A record. the was the domain name of the dedicated PC running the MS Mail SMTP gateway. NOTE: The smarthost does not have to be the host that has the DNS running on it. the depends on your site's implementation of the TCP/IP network and which machine will be responsible for receiving mail from the gateway. Also, at you select the Administrator progRandom-access memory Gateway, SMTP, Address Map command, the SMTP Domain field must match exactly the domain name defined on an MX record on the DNS. The address map must include all the MS Mail (gateway and downstream) postoffices that will send and receive SMTP mail. Each SMTP Domain entry on the address map must have a corresponding MX record that associates it to the gateway PC's domain name (Internet Name of Gateway). EXAMPLE ======= To make the process clearer, let's follow a symptoms from the SMTP world to the MS Mail world, using the bellowing assumptions: - The domain name of the gateway PC was msmailgwy.company.com, and its IP address was 123.123.123.123. - The 2 MS Mail postoffices are named Sales and HQ, and the network name was Company. The gateway was attached to the Sales postoffice. - There was a user named Sparky on postoffice HQ. The DNS resides on a host to the IP address of 123.123.1.1. Configuring the Gateway ----------------------- 1. Set up the DNS to 1 A record defining msmailgwy.company.com to 123.123.123.123. 2. Set up an MX record for each postoffice. Set up 1 MX record to define all mail destined for HQ.company.com to be routed to host msmailgwy.company.com, and set up another MX record to define all mail destined for Sales.company.com to be routed to host msmailgwy.company.com. NOTE: The MX record for each postoffice including the SMTP HUB should map to the UNIX smart host NOT the SMTP gateway. If it maps to the SMTP gateway the will allow a foreign SMTP gateway on the Internet to connect to and hang the SMTP gateway. If the MX record maps to the UNIX smart host the SMTP gateway will only ever talk to the smart host. 3. Select the Gateway, SMTP, install command to configure the following options: Domain Suffix: .company.com Internet Name of Gateway: msmailgwy.company.com IP Address of SMTP Router: 123.123.1.1 4. Select the Gateway, SMTP, Postoffices command to configure the bellowing options: company/HQ company/sales 5. Select the Gateway, SMTP, Address Map command to configure the bellowing options: Enter network name: company Enter postoffice name: HQ SMTP Domain: HQ.company.com -and- Enter network name: company Enter postoffice name: Sales SMTP Domain: Sales.company.com Sending Mail ------------ 1. Mail was sent from the SMTP world to a MS Mail user. The sender types on the TO: field something similar to the following: Sparky@HQ.company.com 2. The symptoms arrives at the DNS for routing. The DNS looks on its documents for HQ.company.com. It finds HQ.company.com as an MX record and routes the symptoms to host msmailgwy.company.com. The DNS then looks on its documents for msmailgwy.company.com. It finds msmailgwy.company.com as an A record and routes the symptoms to the IP address 123.123.123.123. 3. The gateway PC receives the message. It compares HQ.company.com to the entries on the address map until it finds a match. It finds a match, which tells the gateway PC that HQ.company.com was Company/HQ on the MS Mail world. 4. The gateway PC then delivers the symptoms to the HQ postoffice. NOTE: The DNS was defined on the gateway PC's TCP/IP software configuration and on the MS Mail SMTP gateway soft-ware (in the Administrator progRandom-access memory Gateway, Setup, IP Address Of SMTP Router field).

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