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For a mail server that is relaying messages from localhosts to the Internet, you may want to masquerade the source of the messages In large networks that have their own mail servers connected to the Internet, Sendmail masquerading can make messages sent by localhosts appear to be sent by the mail server Their host address will be replaced by the mail server s address Returned mail can then be sent to the mail server and held in POP or IMAP server mailboxes that can be later accessed by users on the localhosts Also, entries in the server s virtual user table could forward mail to corresponding users in localhosts
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Masquerading is often used to mask localhosts with a domain name Any subdomains can also be masqueraded This method can be applied to situations where an ISP or your network administrator has assigned your network its own domain name You can then mask all mail messages as coming from your domain name instead of from particular hosts or from any subdomains you may have For example, if a network s official domain name is mytrekcom, all messages from the hosts in the mytrekcom network, such as rabbitmytrek com and turtlemytrekcom, can be masqueraded to appear as just coming from mytrekcom Should the mytrekcom network have a subnetwork whose domain is mybeachcom, any messages from mybeachcom can also be masqueraded as coming from mytrekcom Masquerading is turned on with the MASQUERADE_AS command This takes as its argument the name you want to masquerade your mail as Normally the name used is just the domain name, without the mail host In the following example, the mail is masqueraded as simply mytrekcom Mail sent from a localhost like turtlemytrekcom will appear to be sent by just mytrekcom:
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MASQUERADE_AS('mytrekcom')dnl
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You will also have to specify the hosts and domains on your local network that your Sendmail server should masquerade If you have decided to masquerade all the hosts in your local network, you need to set the masquerade_entire_domain feature, as in
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FEATURE('masquerade_entire_domain')dnl
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If, instead, you want to masquerade particular hosts or your domain has several subdomains that you want masqueraded, you list them in the MASQUERADE_DOMAIN entry You can list either particular hosts or entire domains For example, given a local network with the localhosts turtlemytrekcom and rabbitmytrekcom, you can list them with the MASQUERADE_DOMAIN to have them masqueraded The domain they are masqueraded as is specified in the MASQUERADE_AS entry
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MASQUERADE_DOMAIN('turtlemytrekcom rabbitmytrekcom')dnl
If you want to masquerade all the hosts in your local network, you can simply list your local network s domain name If your local network also supports several subdomains, you can list those as well to masquerade them For example, to masquerade all the hosts in the mybeachcom domain, you use the following entry:
MASQUERADE_DOMAIN('mytrekcom mybeachcom')dnl
If you have a long list of domains or hosts, or if you want to be able to easily change those that should be masqueraded, you can place them in a file to be read by Sendmail Specify the file with the MASQUERADE_DOMAIN_FILE command:
MASQUERADE_DOMAIN_FILE('mydomains')dnl
If you just want to masquerade all the hosts in your local domain, you use the
masquerade_entire_domain feature:
FEATURE(masquerade_entire_domain)dnl
25:
Mail Servers
A common configuration for a local network specifies the domain name in the
MASQUERADE_AS entry and in the MASQUERADE_DOMAIN entry Using the example myispcom
for the domain, the entries look like this:
MASQUERADE_AS('mytrekcom')dnl FEATURE(masquerade_entire_domain)dnl
If you want to masquerade as an ISP s mail domain, you use the ISP s domain in the
MASQUERADE_AS entry as shown here:
MASQUERADE_AS('myispcom')dnl MASQUERADE_DOMAIN('mytrekcom')dnl
When mail is received from the outside bearing just the address mytrekcom, your network needs to know what host to send it to This is the host designated as the mail server for the mytrekcom network This information is provided by a mail exchange record (MX) in your DNS configuration that will specify that mail sent to mytrekcom will be handled by the mail server in this case, turtlemytrekcom:
mytrekcom IN MX 0 turtlemytrekcom
You also have to be sure that MX relaying is enabled with the relay_based_on_MX feature:
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