Hi, i have a problem with my 2 postfix instances. 2 separate IP's and
coressponding domain names are setup on networking, they are working fine.
I want second mail message (below) to have  <br>
`Received: from firstInstanceDomain.com (firstInstanceDomain.com.
[second.domain.ip])`  <br>
instead of  <br>
`Received: from secondInstanceDomain.com (secondInstanceDomain.com.
[second.domain.ip])` <br>
Othe important information: <br>
-i have DKIM working on both domains <br>
- when i put relayhost = firstInstanceDomain.com in firstInstanceDomain
MAIN.CF i have secondInstanceDomain inside mail message from
firstInstanceDomain, and secondInstanceDomain mail message is ok <br>
- mail headers from both domains, master and main configs are attached
below <br>
**I HAVE SPENT 60 HOURS trying to solve it, searching all google resource,
postfix documenation, blogs and forums. no luck. Please Help!**

MAIL SENT FROM m...@firstinstancedomain.com

    Delivered-To: somem...@domain.com
    Received: by 10.68.49.10 with SMTP id q10cs774841pbn;
            Fri, 6 Jan 2012 08:18:06 -0800 (PST)
    Received: by 10.213.3.136 with SMTP id 8mr1420319ebn.0.1325866683057;
            Fri, 06 Jan 2012 08:18:03 -0800 (PST)
    Return-Path: <m...@firstinstancedomain.com>
    Received: from firstInstanceDomain.com (firstInstanceDomain.com.
[first.domain.ip])
            by mx.google.com with ESMTP id
57si5431812eey.212.2012.01.06.08.18.01;
            Fri, 06 Jan 2012 08:18:02 -0800 (PST)
    Received-SPF: pass (google.com: domain of
mail@firstInstanceDomain.comdesignates first.domain.ip as permitted
sender) client-ip=first.domain.ip;
    Authentication-Results: mx.google.com; spf=pass (google.com: domain of
m...@firstinstancedomain.com designates first.domain.ip as permitted
sender) smtp.mail=m...@firstinstancedomain.com; dkim=pass
header.i=@firstInstanceDomain.com
    To: "somem...@domain.com" <somem...@domain.com>
    DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple;
d=firstInstanceDomain.com;
    s=default; t=1325870581;
    RestOfTheKey
    Subject: SomeSubject
    From: "firstInstanceDomain.com" <m...@firstinstancedomain.com>
    Message-ID: <som...@firstinstancedomain.com>
    Return-To: m...@firstinstancedomain.com
    Date: Fri, 06 Jan 2012 17:23:01 +0000
    Content-Type: multipart/alternative;
    boundary="=_1.e091838bd31325ae4da677be1af4efd5"
    MIME-Version: 1.0
    RestOfTheMessage

MAIL SENT FROM m...@secondinstancedomain.com

    Delivered-To: somem...@domain.com
    Received: by 10.68.49.10 with SMTP id q10cs774832pbn;
            Fri, 6 Jan 2012 08:18:01 -0800 (PST)
    Received: by 10.213.108.146 with SMTP id
f18mr1347667ebp.36.1325866679721;
            Fri, 06 Jan 2012 08:17:59 -0800 (PST)
    Return-Path: <m...@secondinstancedomain.com>
    Received: from firstInstanceDomain.com (firstInstanceDomain.com.
[first.domain.ip])
            by mx.google.com with ESMTP id
3si24805496eeh.44.2012.01.06.08.17.58;
            Fri, 06 Jan 2012 08:17:59 -0800 (PST)
    Received-SPF: softfail (google.com: domain of transitioning
m...@secondinstancedomain.com does not designate first.domain.ip as
permitted sender) client-ip=first.domain.ip;
    Authentication-Results: mx.google.com; spf=softfail (google.com: domain
of transitioning m...@secondinstancedomain.com does not designate
first.domain.ip as permitted sender) smtp.mail=m...@secondinstancedomain.com;
dkim=pass header.i=@secondInstanceDomain.com
    To: "somem...@domain.com" <somem...@domain.com>
    DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple;
d=secondInstanceDomain.com;
    s=dbdef; t=1325870578;
    RestOfTheKey
    Subject: SomeSubject
    From: "secondInstanceDomain.com" <m...@secondinstancedomain.com>
    Message-ID: <som...@secondinstancedomain.com>
    Return-To: m...@secondinstancedomain.com
    Date: Fri, 06 Jan 2012 17:22:58 +0000
    Content-Type: multipart/alternative;
    boundary="=_1.7183ef0339b880f9a93c3d822619afee"
    MIME-Version: 1.0
    RestOfTheMessage

MASTER.CF FOR firstInstanceDomain (rest of config is standard)

    first.domain.ip:smtp      inet  n       -       n       -       -
smtpd -o myhostname=firstInstanceDomain.com -o
mydomain=firstInstanceDomain.com

MASTER.CF FOR secondInstanceDomain (rest of config is standard)

    second.domain.ip:smtp      inet  n       -       n       -       -
  smtpd -o myhostname=secondInstanceDomain.com -o
mydomain=secondInstanceDomain.com

MAIN.CF FOR firstInstanceDomain

    smtp_bind_address = first.domain.ip
    mydomain=firstInstanceDomain.com
    mynetworks=firstInstanceDomain.com
    alternate_config_directories = /etc/postfix-third
    data_directory = /var/lib/postfix
    header_checks = regexp:/etc/postfix/header_checks
    inet_interfaces = localhost
    mydestination = $mydomain, localhost.$mydomain, $mydomain
    myhostname = $mydomain
    myorigin=$mydomain
    queue_directory = /var/spool/postfix
    alias_maps = hash:/etc/aliases
    alias_database = hash:/etc/aliases
    broken_sasl_auth_clients = yes
    command_directory = /usr/sbin
    daemon_directory = /usr/libexec/postfix
    debug_peer_level = 2
    debugger_command =
     PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
     xxgdb $daemon_directory/$process_name $process_id & sleep 5
    default_process_limit = 300
    html_directory = no
    mail_owner = postfix
    mailq_path = /usr/bin/mailq.postfix
    manpage_directory = /usr/share/man
    message_size_limit = 10240000
    newaliases_path = /usr/bin/newaliases.postfix
    readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
    sample_directory = /usr/share/doc/postfix-2.3.3/samples
    sendmail_path = /usr/sbin/sendmail.postfix
    setgid_group = postdrop
    smtp_use_tls = yes
    smtp_tls_note_starttls_offer = yes
    smtpd_client_restrictions=
    smtpd_sasl_authenticated_header = yes
    smtpd_sasl_path = private/auth
    smtpd_sasl_type = dovecot
    smtpd_sasl_local_domain =
    smtpd_sasl_auth_enable = yes
    smtpd_sasl_security_options = noanonymous
    smtpd_sasl_authenticated_header = yes
    smtpd_tls_auth_only = no
    smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key
    smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt
    smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
    smtpd_tls_loglevel = 4
    smtpd_tls_received_header = yes
    smtpd_tls_session_cache_timeout = 3600s
    smtpd_use_tls = yes
    tls_random_source = dev:/dev/urandom
    unknown_local_recipient_reject_code = 550
    mailbox_size_limit = 512000000
    virtual_alias_maps =hash:/etc/postfix/virtual
    smtpd_milters = inet:127.0.0.1:20209
    non_smtpd_milters = inet:127.0.0.1:20209
    milter_protocol = 2
    milter_default_action = accept

MAIN.CF FOR secondInstanceDomain

    smtp_bind_address = second.domain.ip
    mydomain=secondInstanceDomain.com
    mynetworks=secondInstanceDomain.com
    alternate_config_directories = /etc/postfix
    data_directory = /var/lib/postfix-third
    header_checks = regexp:/etc/postfix-third/header_checks
    inet_interfaces = localhost
    mydestination = $mydomain, localhost.$mydomain, $mydomain
    myhostname = $mydomain
    myorigin=$mydomain
    queue_directory = /var/spool/postfix-third
    alias_maps = hash:/etc/aliases
    alias_database = hash:/etc/aliases
    broken_sasl_auth_clients = yes
    command_directory = /usr/sbin
    daemon_directory = /usr/libexec/postfix
    debug_peer_level = 2
    debugger_command =
     PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
     xxgdb $daemon_directory/$process_name $process_id & sleep 5
    default_process_limit = 300
    html_directory = no
    mail_owner = postfix
    mailq_path = /usr/bin/mailq.postfix
    manpage_directory = /usr/share/man
    message_size_limit = 10240000
    newaliases_path = /usr/bin/newaliases.postfix
    readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
    sample_directory = /usr/share/doc/postfix-2.3.3/samples
    sendmail_path = /usr/sbin/sendmail.postfix
    setgid_group = postdrop
    smtp_use_tls = yes
    smtp_tls_note_starttls_offer = yes
    smtpd_client_restrictions=
    smtpd_sasl_authenticated_header = yes
    smtpd_sasl_path = private/auth
    smtpd_sasl_type = dovecot
    smtpd_sasl_local_domain =
    smtpd_sasl_auth_enable = yes
    smtpd_sasl_security_options = noanonymous
    smtpd_sasl_authenticated_header = yes
    smtpd_tls_auth_only = no
    smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key
    smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt
    smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
    smtpd_tls_loglevel = 4
    smtpd_tls_received_header = yes
    smtpd_tls_session_cache_timeout = 3600s
    smtpd_use_tls = yes
    tls_random_source = dev:/dev/urandom
    unknown_local_recipient_reject_code = 550
    mailbox_size_limit = 512000000
    smtpd_milters = inet:127.0.0.1:20209
    non_smtpd_milters = inet:127.0.0.1:20209
    milter_protocol = 2
    milter_default_action = accept

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