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Description Checks for hosts served by the mail server /etc/mail/ local-host-names file Reads a list of users from the /etc/trusted-users file These are trusted users that can change the sender name for their messages Rejects all mail addressed to address REDIRECT, providing a forwarding address is placed in the /etc/aliases file Uses a mailer table file, /etc/mail/mailertable, to override routing for particular domains Uses a domain table file, /etc/mail/domaintable, to map one domain to another Useful if you change your domain name Causes recipient addresses to also masquerade as being from the masquerade host Masquerades all hosts within the domain specified in MASQUERADE_AS Masquerades envelope sender and recipient along with headers For virtual hosts; maps virtual addresses to real addresses Turns a Sendmail server into a null client, which simply forwards mail messages to a central mail server for processing Uses procmail as the local mailer Uses the Sendmail Restricted Shell (smrsh) for mailing Allows you to relay mail, allowing mail to be received from outside your domain and sent on to hosts outside your domain Allows any host in your domain to relay mail (default limits this to hosts in the access database) Checks for relay permission for particular hosts instead of domains
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PART VI
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TABLE 25-3
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Part VI:
Internet and Network Services
Feature
accept_unqualified_ senders accept_unresolvable_ domains
Description Allows sender email addresses to be single usernames instead of just fully qualified names that include domain names Allows Sendmail to accept unresolvable domain names Useful for those users in a local network blocked by a firewall from the full DNS namespace By default, Sendmail requires domains in addresses to be resolvable with DNS Accepts or rejects mail from domains and hosts in the access database Blocks mail to certain users, such as those that should never receive mail like the users nobody and host Rejects hosts in the Realtime Blackhole List Managed by MAPS (Mail Abuse Prevention System LLC) and designed to limit transport of unwanted mass email (mail-abuseorg) Enables LDAP use
access_db blacklist_recipients dnsbl
ldap_routing
TABLE 25-3
Sendmail Features (continued)
In addition, you can set certain configuration options These are variables beginning with the prefix conf that you can set and assign values to using the define command There are an extensive number of configuration options, most of which you will not need to change The following example defines the confAUTO_REBUILD configuration option, which will automatically rebuild the aliases database, if needed:
define('confAUTO_REBUILD')
Certain macros and types of macros need to be placed in the sendmailmc file in a particular sequence, as shown here Notice that MAILER is toward the end and OSTYPE at the beginning Local macro definitions (define) and FEATURE entries follow the OSTYPE and DOMAIN entries:
VERSIONID OSTYPE DOMAIN define FEATURE local macro definitions MAILER LOCAL_RULE_* LOCAL_RULESETS
The local macro and configuration option definitions that affect a particular feature need to be entered before the FEATURE entry For example, the redirect feature uses the aliases file Any local definition of the aliases file needs to be entered before the redirect feature
25:
Mail Servers
define('ALIAS_FILE','/etc/aliases') FEATURE(redirect)
You need to be careful how you enter comments into a sendmailmc file This file is read as a stream of macros, ignoring all white spaces, including newlines No special comment characters are looked for Instead, you have to simulate comment indicators using the dnl or divert commands The dnl command instructs that all characters following that dnl command up to and including the next newline are to be ignored If you place a dnl command at the beginning of a text line in the sendmailmc file, it has the effect of turning that line into a comment, ignoring everything on that line including its newline Even empty lines will require a dnl entry to ignore the newline character:
dnl you will have to /etc/mail/sendmailcf by running this the m4 dnl macro config through preprocessor: dnl
Alternatively, you can use the divert command The divert command will ignore all data until another divert command is reached:
divert(-1) This is the macro config file used to generate the /etc/mail/sendmailcf file If you modify the file regenerate you will have to regenerate /etc/mail/sendmailcf by running the m4 macro divert(0)
For Sendmail to work at all, it requires only that the OSTYPE and MAILERS macros be defined, along with any needed features and options A very simple Sendmail file is shown here: mysendmailmc
dnl My sendmailmc file OSTYPE('linux') define('PROCMAIL_MAILER_PATH','/usr/bin/procmail') FEATURE(redirect) MAILER(procmail) MAILER(smtp)
A sendmailmc file usually contains many more entries, particularly for parameters and features Check the /etc/mail/sendmailmc file on your system to see the standard default entries for Sendmail
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