任何发送到我们公司服务器的邮件的邮件头“来自”域都被服务器的域替换。
例如：
[电子邮件保护]向我们的服务器（company.com）发送电子邮件。我们看到这封电子邮件的发件人是[电子邮件保护]。
我不知道原因。请帮帮我。谢谢！
邮件系统：sendmail + dovecot + saslauthd
发送邮件.mc：
#-----------------------------------------------------------------------------
# $Sendmail: debproto.mc,v 8.14.3 2010-08-03 06:56:05 cowboy Exp $
#
# Copyright (c) 1998-2009 Richard Nelson. All Rights Reserved.
#
# cf/debian/sendmail.mc. Generated from sendmail.mc.in by configure.
#
# sendmail.mc prototype config file for building Sendmail 8.14.3
#
# Note: the .in file supports 8.7.6 - 9.0.0, but the generated
# file is customized to the version noted above.
#
# This file is used to configure Sendmail for use with Debian systems.
#
# If you modify this file, you will have to regenerate /etc/mail/sendmail.cf
# by running this file through the m4 preprocessor via one of the following:
# * make (or make -C /etc/mail)
# * sendmailconfig
# * m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
# The first two options are preferred as they will also update other files
# that depend upon the contents of this file.
#
# The best documentation for this .mc file is:
# /usr/share/doc/sendmail-doc/cf.README.gz
#
#-----------------------------------------------------------------------------
divert(0)dnl
#
# Copyright (c) 1998-2005 Richard Nelson. All Rights Reserved.
#
# This file is used to configure Sendmail for use with Debian systems.
#
define(`_USE_ETC_MAIL_')dnl
include(`/usr/share/sendmail/cf/m4/cf.m4')dnl
include(`/etc/mail/sasl/sasl.m4')dnl
VERSIONID(`$Id: sendmail.mc, v 8.14.3-9.2ubuntu1 2010-08-03 06:56:05 cowboy Exp $')
OSTYPE(`debian')dnl
DOMAIN(`debian-mta')dnl
dnl # Items controlled by /etc/mail/sendmail.conf - DO NOT TOUCH HERE
undefine(`confHOST_STATUS_DIRECTORY')dnl #DAEMON_HOSTSTATS=
dnl #
dnl # General defines
dnl #
dnl # SAFE_FILE_ENV: [undefined] If set, sendmail will do a chroot()
dnl # into this directory before writing files.
dnl # If *all* your user accounts are under /home then use that
dnl # instead - it will prevent any writes outside of /home !
dnl # define(`confSAFE_FILE_ENV', `')dnl
dnl #
dnl # Daemon options - restrict to servicing LOCALHOST ONLY !!!
dnl # Remove `, Addr=' clauses to receive from any interface
dnl # If you want to support IPv6, switch the commented/uncommentd lines
dnl #
FEATURE(`no_default_msa')dnl
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
dnl define(`confAUTH_OPTIONS', `A') dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MTA-v6, Port=smtp, Addr=::1')dnl
DAEMON_OPTIONS(`Family=inet, Name=MTA-v4, Port=smtp, Addr=0.0.0.0')dnl
dnl DAEMON_OPTIONS(`Family=inet6, Name=MSP-v6, Port=submission, M=Ea, Addr=::1')dnl
DAEMON_OPTIONS(`Family=inet, Name=MSP-v4, Port=submission, M=Ea Addr=0.0.0.0')dnl
dnl DAEMON_OPTIONS(`Family=inet, Name=MSP, Port=25 M=Ea')dnl
define(`confDEF_USER_ID',``mail:mail'')dnl
undefine(`UUCP_RELAY')dnl
undefine(`BITNET_RELAY')dnl
define(`confRUN_AS_USER',`root:smmsp')dnl
define(`confTRUSTED_USER', `smmsp')dnl
define(`confTRUSTED_USER', `smmta')dnl
define(`confTO_CONNECT', `1m')dnl
define(`confTRY_NULL_MX_LIST',true)dnl
define(`confDONT_PROBE_INTERFACES',true)dnl
define(`PROCMAIL_MAILER_PATH',`/usr/bin/procmail')dnl
define(`ALIAS_FILE', `/etc/aliases')dnl
define(`STATUS_FILE', `/etc/mail/statistics')dnl
define(`UUCP_MAILER_MAX', `5000000')dnl
define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl
dnl #define(QUEUE_DIR,`/var/spool/mqueue/q*')dnl
define(`confMAX_MESSAGE_SIZE',`40000000')dnl
dnl # added for dns problem defer
define(`confBIND_OPTS', `WorkAroundBrokenAAAA')dnl
dnl #
dnl # Be somewhat anal in what we allow
define(`confPRIVACY_FLAGS',dnl
`needmailhelo,needexpnhelo,needvrfyhelo,restrictqrun,restrictexpand,nobodyreturn,authwarnings')dnl
dnl #
dnl # Define connection throttling and window length
define(`confCONNECTION_RATE_THROTTLE', `15')dnl
define(`confCONNECTION_RATE_WINDOW_SIZE',`10m')dnl
dnl #
dnl # Features
dnl #
dnl # use /etc/mail/local-host-names
FEATURE(`use_cw_file')dnl
dnl FEATURE(`use_ct_file')dnl
dnl # Delay_checks allows sender<->recipient checking
FEATURE(local_procmail,`',`procmail -t -Y -a $h -d $u')dnl
dnl #
dnl # The access db is the basis for most of sendmail's checking
FEATURE(`access_db', , `skip')dnl
FEATURE(`blacklist_recipients')dnl
dnl # blacklist to stop spams
dnl #FEATURE(`dnsbl', `cblless.anti-spam.org.cn')dnl
dnl #FEATURE(`enhdnsbl', `cblplus.anti-spam.org.cn', `"Server address listed at cblplus.anti-spam.org.cn"', `t')dnl
FEATURE(`enhdnsbl', `zen.spamhaus.org', `"Spam blocked see: http://www.abuse.net/sbl.phtml?IP="$&{client_addr}', `t')dnl
dnl #FEATURE(`access_db',`hash -T<TMPF> -o /etc/mail/access.db')dnl
dnl #
dnl # The greet_pause feature stops some automail bots - but check the
dnl # provided access db for details on excluding localhosts...
FEATURE(`greet_pause', `1000')dnl 1 seconds
dnl #
dnl # Delay_checks allows sender<->recipient checking
FEATURE(`delay_checks', `friend', `n')dnl
dnl #
dnl # If we get too many bad recipients, slow things down...
define(`confBAD_RCPT_THROTTLE',`3')dnl
dnl #
dnl # Stop connections that overflow our concurrent and time connection rates
FEATURE(`conncontrol', `nodelay', `terminate')dnl
FEATURE(`ratecontrol', `nodelay', `terminate')dnl
dnl #
dnl # If you're on a dialup link, you should enable this - so sendmail
dnl # will not bring up the link (it will queue mail for later)
dnl define(`confCON_EXPENSIVE',`True')dnl
dnl #
dnl # Dialup/LAN connection overrides
dnl #
include(`/etc/mail/m4/dialup.m4')dnl
include(`/etc/mail/m4/provider.m4')dnl
FEATURE(`smrsh')dnl
FEATURE(`mailertable')dnl
FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable.db')dnl
dnl # add 2013-11-8
FEATURE(masquerade_envelope)dnl
dnl MASQUERADE_DOMAIN(hotmail.com)dnl
MASQUERADE_DOMAIN_FILE(`/etc/mail/masquerade-domain')dnl
MASQUERADE_AS(xxx.xxx.edu.cn)dnl
dnl #
dnl #
dnl # Also accept email sent to "localhost.localdomain" as local email.
dnl #
LOCAL_DOMAIN(`xxx.xxx.edu.cn')dnl
LOCAL_DOMAIN(`xxx.xxx.cn')dnl
LOCAL_DOMAIN(`xxx.cs.xxx.edu.cn')dnl
LOCAL_DOMAIN(`xxx.cs.xxx.cn')dnl
dnl # Default Mailer setup
dnl #MAILER_DEFINITIONS
MAILER(`smtp')dnl
MAILER(`procmail')dnl
MAILER(`local')dnl
两个例子：
163：
From [email protected] Wed Dec 21 21:47:26 2016
Return-Path: <[email protected]>
Received: from m13-141.163.com (m13-141.163.com [220.181.13.141])
by company.com (8.14.3/8.14.3/Debian-9.1ubuntu1) with ESMTP id uBLDlPiQ013409
for <[email protected]>; Wed, 21 Dec 2016 21:47:26 +0800
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com;
s=s110527; h=Date:From:Subject:MIME-Version:Message-ID; bh=hpaD0
qA4I59smafOVhBxwFe3a15FCNfA2uxigC6sgOY=; b=JdNTQe6QHM1TCcgvPCHtw
0Lkr1iMuJpydrsSpywGH8QnwV0hMucgh0IO+jg4THKW+2hr/IaVbQJoJabx2W/Mr
nQ2YWwc7ECDVaFqU9HJJygtqcrP3d2cp3qBbGlq/YVUUkXidTeX52kQStnULVBzk
FEJFuAYeRA/4XZyeo5LxNM=
Received: from example$163.com ( [192.198.95.71, 54.215.2.217, 10.144.1.72] )
by ajax-webmail-wmsvr141 (Coremail) ; Wed, 21 Dec 2016 21:46:07 +0800 (CST)
X-Originating-IP: [192.198.95.71, 54.215.2.217, 10.144.1.72]
Date: Wed, 21 Dec 2016 21:46:07 +0800 (CST)
From: "example" <[email protected]>
To: "[email protected]" <[email protected]>
Subject: aaaaa
X-Priority: 3
X-Mailer: Coremail Webmail Server Version SP_ntes V3.5 build
20160729(86883.8884) Copyright (c) 2002-2016 www.mailtech.cn 163com
X-CM-CTRLDATA: RB7qyGZvb3Rlcl9odG09MjcyNTo1Ng==
Content-Type: multipart/alternative;
boundary="----=_Part_12111914_355555859.1482327967157"
MIME-Version: 1.0
Message-ID: <[email protected]>
X-Coremail-Locale: zh_CN
X-CM-TRANSID:jcGowACXpqKfh1pYSOaiAA--.29831W
X-CM-SenderInfo: p01vzzr06rljoofrz/1tbiNQ1HvlSIRLiDogABsB
X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU==
Status: RO
X-UID: 336
Content-Length: 4432
邮箱：
From [email protected] Wed Dec 21 22:52:39 2016
Return-Path: <[email protected]>
Received: from mail-ua0-f178.google.com (mail-ua0-f178.google.com [209.85.217.178])
by company.com (8.14.3/8.14.3/Debian-9.1ubuntu1) with ESMTP id uBLEqbPm019461
for <[email protected]>; Wed, 21 Dec 2016 22:52:38 +0800
Received: by mail-ua0-f178.google.com with SMTP id 2so79983525uax.2
for <[email protected]>; Wed, 21 Dec 2016 06:52:00 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=gmail.com; s=20161025;
h=mime-version:from:date:message-id:subject:to;
bh=+fBXgxbVSyjlxMpSNMOsZLbhE2bqAQI97mJviWO7ebE=;
b=l1SM9poejQhkOB7y725tK1K8oCsbxSENpl+po0nU+AHzyNE0BguFHgLLrFMj7vnuPG
ARR0mhWhVow3Pikzeq+IrymrsbnEqyOwgehR/ztTYDY8TPfpghK3O7eRPr9XVhC8oFs+
Il9rCu324IljhOstd/5cWhGkwhA/m2F1bLUoxYw0O18GLVE85uQnH7PZe04W21vPLDVq
fuJlrbNFSo4Fxbe626IaS/1CVIUrs5Wkz1YExfa7pADbiqc3RNrEErBrk4FfWRPdHN/y
7z7PxqpHvBs+SG2IMx5eCRA5zdsczQvNXHIy3yIHvwkeydYi77PPzR8qUZ2pSfomzmKu
LKCg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
d=1e100.net; s=20161025;
h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
bh=+fBXgxbVSyjlxMpSNMOsZLbhE2bqAQI97mJviWO7ebE=;
b=CzacaxE4CvL4uxlG4qUkbEm+vAiix3+UR+I7D0xechpMyOGoGrjE/rVfOXl/Zk+8Rr
+F4xjJ+kTd7jv1C5d1NGk7CtjMl8mZpUk2bE7WesYV8PryUbY7b6mHpB7XjL3J3AD90o
UVPpyX9vjeVJ89E03a1rg05yILGEHWh/E3+bByw68HPxdyCss2I0Tri98030QBWRHasj
7BX6qswHzpo2+87yvRpcsBqoSoKgz4L7ydPMt+zXCmxN2VCqw5MX6vLyzuaOIyWR6RFd
Uda7z9lqKw8bOo1ntxaMSTwiHmRWZyWtarvB/1MxPRySsJDIc+4tw1YLbfBNNYiWf3C8
/SMQ==
X-Gm-Message-State: AIkVDXKc6Fge9ySWKwRQDYsVUzsuNqgZ9VBci7aM/TEGB915XFQonbYpgBCqBzht712z1QTbDXlrek9X6dKWfA==
X-Received: by 10.176.85.139 with SMTP id v11mr632414uaa.7.1482331912496; Wed,
21 Dec 2016 06:51:52 -0800 (PST)
MIME-Version: 1.0
Received: by 10.176.16.145 with HTTP; Wed, 21 Dec 2016 06:51:12 -0800 (PST)
From: example <[email protected]>
Date: Wed, 21 Dec 2016 22:51:12 +0800
Message-ID: <CAO+bwXcoowGtdtZBsQB44K27gUtCJEbpuRKpPj=w66YDQE828g@mail.gmail.com>
Subject: fdasfdasfdasdasffdas
To: [email protected]
Content-Type: multipart/alternative; boundary=f403045e286e156bca05442c4b0d
X-UID: 340
Status: RO
Content-Length: 2500