sendmail generates headers that are rejected

[Matt Nielsen]

My sendmail is gernerating email internet headers that are being rejected as spam. I need to reconfigure my sendmail.mc but I am not sure where to start.

I believe I am being rejected because I am sending the email as "dbdev@localhost" (which is the account for the database/application) and it does not match the reply to which is "lab-australia@idexx.com" on two account: 1 different user and 2 different domain. I also think there are issues with the email being relayed from the application server (kestrel) to the email server (taz). Is there anyway I can make this relay transparent?

Example Internet header:
Received: from kestrel.idexxi.com.au (AUSTRALIA1 [192.168.224.50]) by taz.westbrook.idexxi.com with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.2653.13)
id KJH90RXZ; Thu, 4 May 2006 18:28:34 -0400
Received: (from dbdev@localhost)
by kestrel.idexxi.com.au (AIX5.3/8.11.6p2/8.11.0) id k44MSQT405556;
Fri, 5 May 2006 08:28:26 +1000
Date: Fri, 5 May 2006 08:28:26 +1000
Message-Id: <200605042228.k44MSQT405556@kestrel.idexxi.com.a u>
From: lab-australia@idexx.com
Subject: TST-604271I: TEST, FLUFFY
To: matthew-nielsen@idexx.com
Mime-Version: 1.0


Example sendmail.mc
include(`/usr/share/sendmail-cf/m4/cf.m4')
VERSIONID(`linux setup for Red Hat Linux')dnl
OSTYPE(`linux')
define(`confDEF_USER_ID',``8:12'')dnl
undefine(`UUCP_RELAY')dnl
undefine(`BITNET_RELAY')dnl
define(`confAUTO_REBUILD')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', `/var/log/sendmail.st')dnl
define(`UUCP_MAILER_MAX', `2000000')dnl
define(`confUSERDB_SPEC', `/etc/mail/userdb.db')dnl
define(`confPRIVACY_FLAGS', `authwarnings,novrfy,noexpn,restrictqrun')dnl
define(`confAUTH_OPTIONS', `A')dnl
define(`SMART_HOST', `taz.idexxi.com.au')dnl
dnl TRUST_AUTH_MECH(`DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
dnl define(`confAUTH_MECHANISMS', `DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')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
dnl FEATURE(delay_checks)dnl
FEATURE(`no_default_msa',`dnl')dnl
FEATURE(`smrsh',`/usr/sbin/smrsh')dnl
FEATURE(`mailertable',`hash -o /etc/mail/mailertable')dnl
FEATURE(`virtusertable',`hash -o /etc/mail/virtusertable')dnl
FEATURE(`masquerade_entire_domain')
FEATURE(redirect)dnl
FEATURE(always_add_domain)dnl
FEATURE(use_cw_file)dnl
FEATURE(use_ct_file)dnl
FEATURE(local_procmail)dnl
FEATURE(`access_db')dnl
FEATURE(`blacklist_recipients')dnl
MASQUERADE_AS(idexx.com)dnl
MASQUERADE_DOMAIN(idexxi.com.au)dnl
MASQUERADE_DOMAIN(localhost)dnl
FEATURE(masquerade_envelope)dnl
EXPOSED_USER(`root')dnl
dnl This changes sendmail to only listen on the loopback device 127.0.0.1
dnl and not on any other network devices. Comment this out if you want
dnl to accept email over the network.
dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
dnl We strongly recommend to comment this one out if you want to protect
dnl yourself from spam. However, the laptop and users on computers that do
dnl not have 24x7 DNS do need this.
dnl FEATURE(`accept_unresolvable_domains')dnl
dnl FEATURE(`relay_based_on_MX')dnl
MAILER(smtp)dnl
MAILER(procmail)dnl

Any help would be greatly appreciated.
Thanks Matt Nielsen

[Roxoff]

I think you need to add:

define (`confDOMAIN_NAME',`idexx.com')dnl

up near the start somewhere. The actual domain needs to be the same as the domain name from reverse lookups to get past anti-spam software.

If you do this, you'd probably need to change to:

MASQUERADE_AS(idexxi.com.au)dnl