Now logging …

LOCAL_CONFIG

F{PartFrom} -o /etc/mail/from_rejects
HFrom:       $>CheckFrom

LOCAL_RULESETS

SCheckFrom
R$* $={PartFrom} $*     $: REJECTFROM
R$* REJECTFROM $*       $#error $: "553 Rejected , indicates spam.Caused by from: header."

[root@mx-ns mail]# cat /etc/mail/from_rejects
	brown
	james	
[root@mx-ns mail]#

[root@mx-ns mail]# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

[root@mx-ns mail]# service sendmail restart
sm-client を停止中:                                        [  OK  ]
sendmail を停止中:                                         [  OK  ]
sendmail を起動中:                                         [  OK  ]
sm-client を起動中:                                        [  OK  ]
[root@mx-ns mail]#

[root@mx-ns mail]# sendmail -bt
ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter  

> Chefk^\終了
[root@mx-ns mail]# sendmail -bt
ADDRESS TEST MODE (ruleset 3 NOT automatically invoked)
Enter  

> CheckFrom james※アクセス規制対象
CheckFrom          input: james
CheckFrom        returns: $# error $: "553 Rejected , indicates spam.Caused by from: header."
> CheckFrom brown@sample.com※アクセス規制対象
CheckFrom          input: brown @ sample . com
CheckFrom        returns: $# error $: "553 Rejected , indicates spam.Caused by from: header."
> CheckFrom test@log.simalab.com※アクセス規制対象外
CheckFrom          input: test @ log . simalab . com
CheckFrom        returns: test @ log . simalab . com

[ment@log ~]$ telnet 192.168.3.21 25
Trying 192.168.3.21...
Connected to 192.168.3.21.
Escape character is '^]'.
220 mx-ns.simalab.com ESMTP Sendmail 8.14.4/8.14.4; Sun, 20 Mar 2016 11:49:19 +0900
HELO localhost
250 mx-ns.simalab.com Hello [192.168.3.6], pleased to meet you
MAIL FROM:test@log.simalab.lom（エンベロープ）
250 2.1.0 test@log.simalab.lom... Sender ok
RCPT TO:testuser@simalab.com（エンベロープ）
250 2.1.5 testuser@simalab.com... Recipient ok
DATA
354 Enter mail, end with "." on a line by itself
From: james@example.com（fromヘッダー（アクセス制御対象）
To:testuser@simalab.com（toヘッダー）
this is from header test（本文）
.
553 5.0.0 Rejected , indicates spam.Caused by from: header.（553がリターンされ、アクセス拒否成功）

メールサーバ側のログ（送信者アドレス（from:ヘッダー）でのアクセス制御が成功していることを確認）

Mar 20 11:50:15 mx-ns sendmail[7380]: u2K2nJ7u007380: ruleset=CheckFrom, arg1= james@example.com, relay=[192.168.3.6], reject=553 5.0.0 Rejected , indicates spam.Caused by from: header.
Mar 20 11:50:33 mx-ns sendmail[7380]: u2K2nJ7u007380: from=test@log.simalab.lom, size=73, class=0, nrcpts=1, msgid=<201603200249.u2K2nJ7u007380@mx-ns.simalab.com>, proto=SMTP, daemon=MTA, relay=[192.168.3.6]
Mar 20 11:50:33 mx-ns sendmail[7380]: u2K2nJ7u007380: to=testuser@simalab.com, delay=00:01:00, pri=30073, stat=Rejected , indicates spam.Caused by from: header.

[root@mx-ns mail]#  service sendmail reload