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The m4 macro language can be used to create a sendmail.cf file, by using a set of predefined macros that has been developed for use with sendmail. In order to create a sendmail.cf file using m4 macros, a text file containing a list of macros to run, and the appropriate parameter values for your site, needs to be created (typically called sendmail.mc). Once you have installed this file into the cf/cf subdirectory underneath the main sendmail directory, then you can use the following command from that directory to build a new sendmail.cf file:
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# cp /etc/sendmail.cf /etc/sendmail.orig # m4 ../m4/cf.m4 sendmail.mc > /etc/sendmail.cf
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The first command backs up the current production sendmail.cf file, while the next command builds a new production sendmail.cf file. After you start sendmail, by using the command defined in the previous section, sendmail will be running with the new configuration. Before you examine a sample sendmail.mc file, take a closer look at the macros and parameters that can be used to configure sendmail.
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The following macros are defined for use with sendmail.mc: DOMAIN Used to define common elements for mail servers with the same domain name EXPOSED_USER FEATURE Prevents domain masquerading for specific users Enables a specific sendmail feature
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MAILER Specifies the mail-delivery program to use on the server (local, smtp, or procmail) MASQUERADE_AS Inserts an effective domain on all outgoing e-mail rather than the real domain OSTYPE Defines the host operating system type
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Once the basic domain and operating system parameters have been generated, the next step is to enable specific sendmail features by using the FEATURE macro. One instance of FEATURE is required for every feature that is to be enabled. Commonly used features include accept_unqualified_senders Accepts messages for delivery from users with e-mail addresses that do not have an FQDN. accept_unresolvable_domains Accepts messages for delivery from users with e-mail addresses whose FQDN is not resolvable. access_db Enables a database of senders and domains to be maintained from whom mail is automatically bounced or rejected.
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27:
Sendmail
always_add_domain Inserts FQDN onto all e-mails sent through sendmail, even those that are being delivered to local users. blacklist_recipients e-mail. domaintable Defines a list of recipients who are not allowed to receive
Substitutes a new domain name for a previous domain name.
mailertable Allows a different mail server to be associated with each virtual domain supported. nullclient Allows local sendmail instances to forward all messages to a single outbound sendmail server for delivery. promiscuous_relay Allows relay of mail from any site through the local server. This should never be used, because of the risk that spam merchants will find your server and use it to relay spam to obscure its true origin. redirect Redirects messages destined for users who no longer exist on the system. Requires a corresponding entry in /etc/aliases with the name of the former user and his/her new e-mail address. relay_based_on_mx Uses the MX record defined in DNS to determine if the local sendmail server is the correct server to relay messages from other servers. relay_entire_domain Permits all hosts within the local domain to route e-mail through the local sendmail server. smrsh A functionally limited shell that can be used to restrict system access by the sendmail daemon. use_ct_file Prevents users from changing the username part of their e-mail addresses on outbound e-mails. use_cw_file Contains a list of all DNS aliases for the mail server. virtusertable Supports routing of e-mail for user accounts with the same username that actually belongs to different virtual domains. Thus, joe@domainone.com is not confused with joe@domaintwo.com, even though both domains use the same sendmail instance.
Parameters
Specific parameters can be set for sendmail s operation with the m4 define command. Although most of the values set by default within sendmail will be satisfactory for normal use, you may occasionally need to change a value. sendmail defines a very large number of parameters, but only some of the most commonly modified parameters are examined here: confDOMAIN_NAME If your DNS server is unreliable, then you might want to set the default domain name here. confLOG_LEVEL Specifies the logging level for sendmail from 0 (minimal) to 13 (everything).
Part VI:
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