FortiMail Gateway Setup and Configuration Technical Note
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1 FortiMail Gateway Setup and Configuration Technical Note FortiMail Gateway Setup and Configuration Technical Note Document Version: Version 1 Publication Date: 04 April 2005 Description: This technical note highlights some FortiMail Gateway installation and configuration issues and provides additional practical background information not available in the FortiMail Administration Guide. Product: FortiMail v2.0 Document Number:
2 Fortinet Inc. Copyright 2005 Fortinet Inc. All rights reserved. No part of this publication including text, examples, diagrams or illustrations may be reproduced, transmitted, or translated in any form or by any means, electronic, mechanical, manual, optical or otherwise, for any purpose, without prior written permission of Fortinet Inc. FortiMail Gateway Setup and Configuration Technical Note v April Trademarks Products mentioned in this document are trademarks or registered trademarks of their respective holders. Regulatory Compliance FCC Class A Part 15 CSA/CUS
3 Contents Table of Contents Overview... 3 Configuring DNS... 4 DNS tools... 4 Using the host (UNIX) tool... 5 Using the nslookup (UNIX or Windows) tool... 5 DNS troublshooting using nslookup... 6 Configuring the FortiMail Gateway... 6 Network settings... 7 DNS entries... 7 Routing entries... 8 Mail server entries... 8 Profile entries... 8 Policy entries... 9 Testing the FortiMail Gateway Sending an Using commands Telneting to the FortiMail Gateway Communicating with the SMTP service Technical Note
4 Contents Fortinet Inc.
5 FortiMail Gateway Setup and Configuration This document highlights some FortiMail Gateway installation and configuration issues and provides additional practical background information not available in the FortiMail Administration Guide. This technical note contains the following sections: Overview Configuring DNS Configuring the FortiMail Gateway Testing the FortiMail Gateway Overview The FortiMail Gateway can effectively protect your server by scanning the SMTP traffic going through it for viruses and spam messages. It can also archive s for backup and monitoring purposes. The FortiMail unit integrates into your existing network with only minor changes to your network configuration. While there are multiple possible combinations when implementing both internal and external systems with the FortiMail Gateway, this technical note will use a simple network design as shown in Figure 1. This network design uses an internal server for user storage. The FortiMail Gateway acts as a relay server that receives and screens any incoming s from the Internet before delivering them to the internal system for final delivery. Figure 1: Network design Firewal Internal mail / DNS server ( mail.inside.com) Internal External mail / DNS servers ( mail.outside.com) FortiMail ( fortimail.dmz.inside.com) DMZ 04 April
6 FortiMail Gateway Setup and Configuration Configuring DNS Setting up and configuring the FortiMail Gateway by: Configuring DNS Configuring the FortiMail Gateway Testing the FortiMail Gateway Configuring DNS DNS is used to identify IP addresses and their related host names. For example, when you type ping the ping program attempts to reach an IP address. A DNS server (or multiple servers) identifies the IP address associated with the server that hosts and provides the IP to the ping program. While DNS has multiple record types, this technical note only focuses on the following: MX records: The record type that identifies a mail server responsible for a particular domain. A records: The record type that identifies an IP address associated with a Fully Qualified Domain Name (FQDN), for example, To successfully implement the network design in Figure 1, you must ensure that the DNS MX record on each domain identifies the FQDN of the FortiMail system. There must also be a corresponding A record that identifies the IP address of the FortiMail Gateway s FQDN. The following is an example of the MX and A records based on network design in Figure 1: MX record: inside.com.in MX 0 fortimail.inside.com A record: fortimail.inside.com IN A The 0 for the MX record identifies a weight. This is commonly 0, but can be used to distribute s among multiple mail relays, or provide an alternate mail server in case the primary fails. While there are many different types of DNS servers available, and a multitude of interfaces that allow administrators to configure the database, this technical note is based on a system running Suse Lunix 9.2 system as the operating system, utilizing the embedded DNS server. In this case, the DNS file location is at /var/lib/named/master and the file name is inside.com. To configure the DNS, edit the inside.com file and add or modify the MX record and A record as described above. Once you have modified the DNS entries, restart the DNS server. On the Suse 9.2 system, this can be achieved by entering /etc/init.d/named restart and pressing Enter. DNS tools It is important to ensure that the MX and corresponding A records have been set correctly for the domain supporting the FortiMail Gateway. In our example, make sure that the mail server handling mail for inside.com is shown as fortimail.inside.com (the FQDN for the FortiMail system), and the IP address is correct for the FQDN Fortinet Inc.
7 Configuring DNS FortiMail Gateway Setup and Configuration There are a number of tools you can use to test the DNS records. In this document, the tool set is limited to commands available on UNIX or Windows based systems. Using the host (UNIX) tool The host tool is a simple utility for performing DNS lookups to ensure the DNS settings are correct. It is normally used to convert names to IP addresses and vice versa. To test the MX settings in our example, from a UNIX prompt, enter: Command host -t mx fortimail.inside.com <return> Response inside.com mail is handled by 0 fortimail.inside.com Note: In the command, -t is used to specify which record type to locate for the domain; mx identifies the record type as mail. The response shows that the DNS entry is correct, and incoming s will be forwarded to the IP address associated with fortimail.inside.com. To test that the A record is also correct, from a UNIX prompt, enter: Command host fortimail.inside.com <return> Response fortimail.inside.com has address Using the nslookup (UNIX or Windows) tool Unlike the host command, nslookup is an interactive tool with its own CLI. This document only introduces the commands responsible for identifying MX records and testing A records. Identifying MX records To identify a MX record, from a UNIX or Windows command prompt, type: nslookup and press Return. The response should be a prompt ( > ). From that prompt, you can issue commands to the DNS server. To identify the mail server responsible for a domain, you must first set the type of record to find, then type the domain you are looking for. For example, to find the MX record for inside.com, you type: set type=mx <return> inside.com <return> The most important information to look for in the response is mail exchanger. For example: inside.com mail exchanger = 0 fortimail.inside.com This response shows that the MX record for inside.com is correct and identifies the FortiMail FQDN as the system responsible for incoming s. Technical Note
8 FortiMail Gateway Setup and Configuration Configuring the FortiMail Gateway Testing A records To test the A record using our example, from a UNIX or Windows prompt, type: nslookup <return> fortimail.inside.com The important information to look for in the response is Name: and Address:, such as: Name: fortimail.inside.com Address: DNS troublshooting using nslookup If you get an unexpected response when using the nslookup tool, try stopping and restarting the DNS server you modified, which should always be done when modifying anything in the DNS database. If you are sure you have entered the right information but are still getting the wrong responses, identify which DNS server your client is using. DNS servers cache entries, and if you have multiple DNS servers, it may take a while before the update is distributed between all of them. A simple method of testing DNS updates on the server you modified is forcing the nslookup tool to get the DNS information from a specific server. The following is an example of a client that is assigned an alternate DNS than the one you modified, but you still need to ensure that the entries are correct. From a command prompt (UNIX or Windows), type: nslookup <return> server x.x.x.x <return> x.x.x.x is the IP address of the DNS server you modified. This command forces the nslookup tool to get the DNS record information from that specific server. This overrides the client's DNS settings (while using nslookup only). The response will be: Default server: x.x.x.x Address: x.x.x.x#53 This response means that the DNS you will be using (until you exit nslookup) is x.x.x.x. Retry the nslookup commands. If you still get a wrong response, restart the DNS server your client is using, or recheck that the DNS server you modified is the correct one and the changes were saved. Configuring the FortiMail Gateway With the DNS server correctly configured, you can now configure the FortiMail system. See the FortiMail Administration Guide for detailed configuration information. Configure the IP address of an interface so you can the FortiMail Gateway via the Web-based manager (see the FortiMail Administration Guide). Make sure the FortiMail is in Gateway mode (System > Status > Operation Mode) Fortinet Inc.
9 Configuring the FortiMail Gateway FortiMail Gateway Setup and Configuration Network settings Configure the network properties of the system: DNS Routing (default gateway) DNS entries Specify the DNS server(s) that allows the FortiMail Gateway to access the internal mail server (A record for the FQDN of the mail server). The DNS settings must allow the FortiMail Gateway to access DNS entries for the Internet. This can be achieved by adding an additional DNS server (typically the ISP's), or making sure that your internal DNS server has a forwarder defined as an external DNS server for entries it cannot resolve. System > Network > DNS Technical Note
10 FortiMail Gateway Setup and Configuration Configuring the FortiMail Gateway Routing entries Specify a default route for the FortiMail system. Otherwise you will have problems receiving and/or delivering mail if you have multiple IP networks defined in your environment. System > Network > DNS Mail server entries Configure Mail Server to provide the host name of the FortiMail system and the domain name to which the FortiMail Gateway belongs. You can also choose to modify the application port (25) used for SMTP communications to the internal mail server, define a maximum message size for incoming s, and enable SSL support (this just tells the FortiMail Gateway that SSL is an available option, it does not force SSL communications). Note: The domain entry of the FortiMail system MUST be different from the domain entry used by the receiving mail server. As you can see from the Network design used in this document, a sub domain within inside.com is created to accommodate the FortiMail requirement. System > Mail Server > Setting Profile entries Profiles need to be available for both antispam and antivirus services. See the FortiMail Administration Guide for details on profile creation Fortinet Inc.
11 Configuring the FortiMail Gateway FortiMail Gateway Setup and Configuration Profile > Anti-Spam Policy entries Policies are important settings that define which domains will be serviced by FortiMail Gateway and which users will receive mails within each domain. Policy > Policy > Create New Domain FQDN: Enter the domain to which the server belongs (in our example, it is inside.com) and the IP address of the server. The domain used in this field must be different from the Local Domain Name under Mail server entries on page 8. Once you have created the policy, you need to edit it and add users that are allowed to receive from this domain. Select the edit icon for the policy you created and select Create New. To ensure all of your users will receive s, enter * in the User Name field. Then select the Antispam and Antivirus profiles you created (or were available by default). You can leave Authentication as the defaults and select OK. Technical Note
12 FortiMail Gateway Setup and Configuration Testing the FortiMail Gateway Testing the FortiMail Gateway After installing and configuring the FortiMail Gateway, you can test the installation by: Sending an Using commands Sending an Send an from an external system to an internal user. If the user receives the without any problems, the installation is successful. Using commands You can use some simple commands to test that the FortiMail Gateway accepts SMTP communications and the server policies are configured correctly. Telneting to the FortiMail Gateway From a command prompt (UNIX or Windows) on your management computer, telnet to the SMTP port (for example, 25) of the FortiMail Gateway to test the connection to the SMTP service on the FortiMail Gateway. For example, if your FortiMail host name is FortiMail.com, you enter: Fortinet Inc.
13 Testing the FortiMail Gateway FortiMail Gateway Setup and Configuration Command telnet FortiMail.com 25 <return> Response Connected to fortimail.com Escape character is '^] 220 fortimail.com ESMTP Smtpd; <date and time> This response means you are connected to the SMTP service on the FortiMail Gateway. You are now able to communicate with the SMTP service using SMTP commands. Communicating with the SMTP service After connecting to the SMTP service on the FortiMail Gateway (see Telneting to the FortiMail Gateway on page 10), you can use SMTP commands to simulate sending s from an external server to an internal user. This will verify that the FortiMail Gateway receives s from external servers and forwards the s to internal users via the internal mail server or relays the s to other servers based on the recipient addresses. For example, if your client host name is mail.example.com and you want to simulate generating an sent by an outside user to an internal user enter: Commands Responses ehlo mail.example.com <return> 250-mail.example.com Hello <client_hostname> <client_ip>, pleased to meet you mail <return> Sender ok rcpt <return> Recipient ok data <return> 354 Enter mail, end with "." on a line by itself this is a test message <return>. <return> j2tiw3mk Message accepted for delivery The above commands and responses show that the FortiMail Gateway is accepting s from external SMTP services and will deliver the s to the internal users. You should now be able to send and receive s between external servers and your internal server. The incoming s are routed via the FortiMail Gateway. Technical Note
14 FortiMail Gateway Setup and Configuration Testing the FortiMail Gateway Fortinet Inc.
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