Книга: Linux Network Administrator Guide, Second Edition

Two Example sendmail.mc Files

Two Example sendmail.mc Files

If you're an administator of a number of different mail hosts, you might not want to name your configuration file sendmail.mc. Instead, it is common practice to name it after the host - vstout.m4 in our case. The name doesn't really matter as long as the output is called sendmail.cf. Providing a unique name for the configuration file for each host allows you to keep all configuration files in the same directory and is just an administrative convenience. Let's look at two example macro configuration files so we know where we are heading.

Most sendmail configurations today use SMTP only. It is very simple to configure sendmail for SMTP. Example 18.1 expects a DNS name server to be available to resolve hosts and will attempt to accept and deliver all mail for hosts using just SMTP.

Example 18.1: Sample Configuration File vstout.smtp.m4

divert(-1)
#
# Sample configuration file for vstout - smtp only
#
divert(0)
VERSIONID(`@(#)sendmail.mc 8.7 (Linux) 3/5/96')
OSTYPE(`linux')
#
# Include support for the local and smtp mail transport protocols.
MAILER(`local')
MAILER(`smtp')
#
FEATURE(rbl)
FEATURE(access_db)
# end

A sendmail.mc file for vstout at the Virtual Brewery is shown in Example 18.2. vstout uses SMTP to talk to all hosts on the Brewery's LAN, and you'll see the commonality with the generic SMTP-only configuration just presented. In addition, the vstout configuration sends all mail for other destinations to moria, its Internet relay host, via UUCP.

Example 18.2: Sample Configuration File vstout.uucpsmtp.m4

divert(-1)
#
# Sample configuration file for vstout
#
divert(0)
VERSIONID(`@(#)sendmail.mc 8.7 (Linux) 3/5/96')
OSTYPE(`linux')
dnl
# moria is our smart host, using the "uucp-new" transport.
define(`SMART_HOST', `uucp-new:moria')
dnl
# Support the local, smtp and uucp mail transport protocols.
MAILER(`local')
MAILER(`smtp')
MAILER(`uucp')
LOCAL_NET_CONFIG
# This rule ensures that all local mail is delivered using the
# smtp transport, everything else will go via the smart host.
R$* ‹ @ $*.$m. › $* $#smtp $@ $2.$m. $: $1 ‹ @ $2.$m. › $3
dnl
#
FEATURE(rbl)
FEATURE(access_db)
# end

If you compare and contrast the two configurations, you might be able to work out what each of the configuration parameters does. We'll explain them all in detail.

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