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Operating Systems AIX Issues on email delivery
# 1  
Old 10-02-2009
Issues on email delivery
Hello, there is a problem when using sendmail to certain destinations, basically the recipient will reject the incoming message because the user@local.domain.com is used as the sender (Return-Path), they would verify local.domain.com is not a valid DNS record which is true because it is a local machine.

However the "From:" field in the custom header contains a valid address and host in DNS, let's say popeye@spinach.com.

Why does sendmail use @local.domain.com instead of using @spinach.com? I have a feeling this is solely down to the Return-Path because when I used the command "sendmail -t < header.txt -f popeye@spinach.com" it was received fine but that is abit of a hack fix.

I then tried setting "Return-Path: popeye@spinach.com" in the custom header.txt but it seemed to be keep overriding to user@local.domain.com again. So I proceeded to the look inside sendmail.cf, changed the Return-Path setting:
From:-
Code:
H?P?Return-Path: <$g>

To:-
Code:
H?P?Return-Path: <$f>

Refreshed sendmail, and triggered another message... however this made no difference it seems.

The recipient receives this message in the logs when rejecting:
Quote:
Oct 2 11:20:15 mail0 postfix/smtpd[14382]: NOQUEUE: reject: RCPT from
unknown[123.234.345.45]: 450 4.1.8 <user@local.domain.com
<mailto:user@local.ourdomain.com>>: Sender address rejected: Domain not found; from=<user@local.ourdomain.com <mailto:user@local.ourdomain.com>>
to=<user.name@recipientdomain.com
<mailto:user.name@recipientdomain.com>> proto=ESMTP helo=<gateway01.domain.com>
Here is what we get in our logs, I highlighted the important part:
Quote:
Received Time: 30 Sep 2009 08:51:41 (GMT -0400)
MID: 44444444
Message Size: 3150 (Byte)
Subject: TEST EMAIL
Envelope Sender: user@local.ourdomain.com
Envelope Recipients: user.name@recipientdomain.com
Message ID Header: <200909301234.asdf1234567@local.ourdomain.com>
IronPort Host: GATEWAY01 (123.123.123.123)
SMTP Auth User ID: N/A
Sending Host Summary
Reverse DNS Hostname: None (unverified)
IP Address: 123.123.123.123
SBRS Score: not enabled
Processing Details
MAIL POLICY "Corporate Email" MATCHED THESE RECIPIENTS: user.name@recipientdomain.com
30 Sep 2009 08:51:41 (GMT -0400) Protocol SMTP interface OutboundInterface (IP 123.123.123.123) on incoming connection (ICID 123321123) from sender IP 123.123.123.123. Reverse DNS host None verified 0.
30 Sep 2009 08:51:41 (GMT -0400) (ICID 123321123) RELAY sender group RELAYLIST match 123.123.123/24 SBRS not enabled
30 Sep 2009 08:51:41 (GMT -0400) Start message 44444444 on incoming connection (ICID 123321123).
30 Sep 2009 08:51:41 (GMT -0400) Message 44444444 enqueued on incoming connection (ICID 123321123) from user@local.ourdomain.com.
30 Sep 2009 08:51:41 (GMT -0400) Message 44444444 on incoming connection (ICID 123321123) added recipient (user.name@recipientdomain.com).
30 Sep 2009 08:51:41 (GMT -0400) Message 44444444 contains message ID header '<200909301251.n8UCpfZV1003650@local.ourdomain.com>'.
30 Sep 2009 08:51:41 (GMT -0400) Message 44444444 original subject on injection: TEST EMAIL
30 Sep 2009 08:51:41 (GMT -0400) Message 44444444 (3150 bytes) from user@local.ourdomain.com ready.
30 Sep 2009 08:51:41 (GMT -0400) Message 44444444 matched per-recipient policy Corporate Email for outbound mail policies.
30 Sep 2009 08:51:41 (GMT -0400) Message 44444444 scanned by Anti-Virus engine Sophos. Interim verdict: CLEAN
30 Sep 2009 08:51:41 (GMT -0400) Message 44444444 scanned by Anti-Virus engine. Final verdict: Negative
30 Sep 2009 08:51:41 (GMT -0400) Message 44444444 queued for delivery.
30 Sep 2009 08:51:42 (GMT -0400) SMTP delivery connection (DCID 55555555) opened from IronPort interface 147.179.184.137 to IP address 204.248.176.91 on port 25.
30 Sep 2009 08:51:42 (GMT -0400) (DCID 55555555) Delivery started for message 44444444 to user.name@recipientdomain.com.
30 Sep 2009 08:51:42 (GMT -0400) (DCID 55555555) Message 44444444 to user.name@recipientdomain.com delayed. Reason: 4.1.0 - Unknown address error ('450', ['<user@local.ourdomain.com>: Sender address rejected: Domain not found']) [('from', 'popeye@spinach.com')]
30 Sep 2009 08:51:42 (GMT -0400) Message 44444444 to user.name@recipientdomain.com pending until Wed Sep 30 08:52:42 2009 as per bounce profile Default.
30 Sep 2009 08:52:43 (GMT -0400) SMTP delivery connection (DCID 77777777) opened from IronPort interface 147.179.184.137 to IP address 204.248.176.91 on port 25.
30 Sep 2009 08:52:43 (GMT -0400) (DCID 77777777) Delivery started for message 44444444 to user.name@recipientdomain.com.
30 Sep 2009 08:52:43 (GMT -0400) (DCID 77777777) Message 44444444 to user.name@recipientdomain.com delayed. Reason: 4.1.0 - Unknown address error ('450', ['<user@local.ourdomain.com>: Sender address rejected: Domain not found']) [('from', 'popeye@spinach.com')]
30 Sep 2009 08:52:43 (GMT -0400) Message 44444444 to user.name@recipientdomain.com pending until Wed Sep 30 08:54:47 2009 as per bounce profile Default.
30 Sep 2009 08:54:50 (GMT -0400) (DCID 53198980) Delivery started for message 44444444 to user.name@recipientdomain.com.
30 Sep 2009 08:54:50 (GMT -0400) (DCID 53198980) Message 44444444 to user.name@recipientdomain.com delayed. Reason: 4.1.0 - Unknown address error ('450', ['4.1.8 <user@local.ourdomain.com>: Sender address rejected: Domain not found']) [('from', 'popeye@spinach.com')]
30 Sep 2009 08:54:50 (GMT -0400) Message 44444444 to user.name@recipientdomain.com pending until Wed Sep 30 09:01:08 2009 as per bounce profile Default.
Thanks for any help you can provide.
# 2  
Old 10-05-2009
Additionally, adding the server address to public DNS is not going to happen for security reasons.

The answer is having sendmail deliver the message with the sender as @spinnach.com (perferably the same as the From: ), instead of the machine address user@local.
# 3  
Old 10-05-2009
if postfix is an option for you, I wrote this tutorial:
http://tech.gate.io/blogpost34


your problem is the "from" field

if you want, I have a sendmail solution too which I can post tomorrow
this one has the advantage, that "from" field is rewritten to

Code:
From: hostname <username@domainyoulike.com>


for AIX, you have to run "newaliases" after postfix the installation, then it'll work fine
Last edited by funksen; 10-05-2009 at 03:29 PM..
# 4  
Old 10-05-2009
Quote:
Originally Posted by funksen
if postfix is an option for you, I wrote this tutorial:
tech.gate.io : Postfix sender address rewriting, changing mails "from" field in header on relay server


your problem is the "from" field

if you want, I have a sendmail solution too which I can post tomorrow
this one has the advantage, that "from" field is rewritten to

Code:
From: hostname <username@domainyoulike.com>

for AIX, you have to run "newaliases" after postfix the installation, then it'll work fine
I'm not sure that the problem is the "From:" field because it is showing the correct address? I don't think I would be allowed to install postfix....
# 5  
Old 10-05-2009
shoudn't it be

from=<user@ourdomain.com
instead of
from=<user@local.ourdomain.com
?
# 6  
Old 10-05-2009
Quote:
Originally Posted by funksen
shoudn't it be

from=<user@ourdomain.com
instead of
from=<user@local.ourdomain.com
?
Yeah... now I'm confused because it shows the correct From: address when it is sent to me (I'm CCing myself).

The sendmail.cf is showing $g's, perhaps changing the $g to $f might help... or maybe I'm going into the totally wrong direction.
H?F?From: $?x$x <$g>$|$g$.
# 7  
Old 10-06-2009
in the mc file:
Code:
FEATURE(masquerade_entire_domain)
FEATURE(masquerade_envelope)
MASQUERADE_AS(`external.domain')
MASQUERADE_DOMAIN(`hostname.domain.local')

in the sendmail.cf file, comment

#CL root
#C{E}root

so that the masquerading works for root too
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