Sendmail 配置文件如下：

　　/etc/mail/sendmail.mc

　　dnl #

　　dnl # This is the sendmail macro config file for m4. If you make changes to

　　dnl # /etc/mail/sendmail.mc, you will need to regenerate the

　　dnl # /etc/mail/sendmail.cf file by confirming that the sendmail-cf package is

　　dnl # installed and then performing a

　　dnl #

　　dnl # make -C /etc/mail

　　dnl #

　　include(`/usr/share/sendmail-cf/m4/cf.m4')dnl (將sendmail-cf/m4/cf.m4包含進來)

　　VERSIONID(`setup for Red Hat Linux')dnl (定義版本信息)

　　OSTYPE(`linux')dnl (選擇包含操作系統指定屬性的文件)

　　dnl #

　　dnl # default logging level is 9, you might want to set it higher to

　　dnl # debug the configuration

　　dnl #

　　dnl define(`confLOG_LEVEL', `9')dnl

　　dnl #

　　dnl # Uncomment and edit the following line if your outgoing mail needs to

　　dnl # be sent out through an external mail server:

　　dnl #

　　dnl define(`SMART_HOST',`smtp.your.provider')

　　dnl #

　　define(`confDEF_USER_ID',``8:12'')dnl (指定使用的用戶ID為8，組ID為12)

　　dnl define(`confAUTO_REBUILD')dnl

　　define(`confTO_CONNECT', `1m')dnl (設置等待連接的最大時間為1分鐘)

　　define(`confTRY_NULL_MX_LIST',true)dnl (若MX記錄指向本機，則sendmail直接連接到遠程主機)

　　define(`confDONT_PROBE_INTERFACES',true)dnl (sendmial不會自動將服務器的網絡接口視為有效地址)

　　define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail')dnl(設置procmail的存放路徑)

　　define(`ALIAS_FILE', `/etc/aliases')dnl (設置郵件別名存放路徑)

　　define(`STATUS_FILE', `/var/log/mail/statistics')dnl

　　define(`UUCP_MAILER_MAX', `2000000')dnl (設置處理信息的最大限制為2M)

　　define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl (設置用戶數據庫文件路徑)

　　define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl (設置限制某些郵件命令的標志)

　　define(`confAUTH_OPTIONS', `A')dnl 僅在授權成功時。將AUTH參數加到郵件的消息頭中

#p#

　　dnl #

　　dnl # The following allows relaying if the user authenticates, and disallows

　　dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links

　　dnl #

　　dnl define(`confAUTH_OPTIONS', `A p')dnl

　　dnl #

　　dnl # PLAIN is the preferred plaintext authentication method and used by

　　dnl # Mozilla Mail and Evolution, though Outlook Express and other MUAs do

　　dnl # use LOGIN. Other mechanisms should be used if the connection is not

　　dnl # guaranteed secure.

　　dnl # Please remember that saslauthd needs to be running for AUTH.

　　dnl #

　　dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

　　dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl

　　dnl #

　　dnl # Rudimentary information on creating certificates for sendmail TLS:

　　dnl # cd /usr/share/ssl/certs; make sendmail.pem

　　dnl # Complete usage:

　　dnl # make -C /usr/share/ssl/certs usage

　　dnl #

　　dnl define(`confCACERT_PATH',`/usr/share/ssl/certs')

　　dnl define(`confCACERT',`/usr/share/ssl/certs/ca-bundle.crt')

　　dnl define(`confSERVER_CERT',`/usr/share/ssl/certs/sendmail.pem')

　　dnl define(`confSERVER_KEY',`/usr/share/ssl/certs/sendmail.pem')

　　dnl #

　　dnl # This allows sendmail to use a keyfile that is shared with OpenLDAP's

　　dnl # slapd, which requires the file to be readble by group ldap

　　dnl #

　　dnl define(`confDONT_BLAME_SENDMAIL',`groupreadablekeyfile')dnl

　　dnl #

　　dnl define(`confTO_QUEUEWARN', `4h')dnl

　　dnl define(`confTO_QUEUERETURN', `5d')dnl

　　dnl define(`confQUEUE_LA', `12')dnl

　　dnl define(`confREFUSE_LA', `18')dnl

　　define(`confTO_IDENT', `0')dnl

　　dnl FEATURE(delay_checks)dnl

一口氣看完sendmail的配置文件，那就不簡單了，我會在后面文章給大家介紹下半部分。

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