RE: PLEASE READ:SMTP forwarder isn't forwarding messages with "return -path <>".

  • From: "ONG Liang Bu (CSC)" <lbong@xxxxxxxxxx>
  • To: "[ExchangeList]" <exchangelist@xxxxxxxxxxxxx>
  • Date: Wed, 29 Jan 2003 22:27:36 +0800

Just curious, is the IIS in the DMZ acts as smart relay and
forward mails to internal Exchange servers, you mentioned "remote domains",
means you have more than one tcp/ip domains?

-----Original Message-----
From: Lenny Burns [mailto:lenny.burns@xxxxxxxxxx]
Sent: Wednesday, January 29, 2003 10:17 PM
To: [ExchangeList]
Subject: [exchangelist] RE: PLEASE READ:SMTP forwarder isn't forwardin g
messages with "return -path <>".


http://www.MSExchange.org/

Postmaster is available, but no, they are not delivered there either.


-----Original Message-----
From: ONG Liang Bu (CSC) [mailto:lbong@xxxxxxxxxx] 
Sent: Wednesday, January 29, 2003 7:31 AM
To: [ExchangeList]
Subject: [exchangelist] RE: PLEASE READ:SMTP forwarder isn't forwarding
messages with "return -path <>".


http://www.MSExchange.org/

Do you define a Postmaster email address for yr domain?

I will assume all mails from <> are NDRs and will be delivered to
postmaster@xxxxxxxxxx  If you already have postmaster address then I am at a
lost also.

-----Original Message-----
From: Lenny Burns [mailto:lenny.burns@xxxxxxxxxx]
Sent: Wednesday, January 29, 2003 7:36 AM
To: [ExchangeList]
Subject: [exchangelist] PLEASE READ:SMTP forwarder isn't forwarding messages
with "return -path <>".
Importance: High


http://www.MSExchange.org/

I have posted this several times using various descriptions of the problem.

!!!I REALLY NEED EXPERT HELP HERE!!!!

I have researched this situation everywhere and still nothing works.

I put my exchange server inside the firewall and used a IIS5 (windows 2000)
SMTP server to FORWARD MAIL to it.

Only remote domains in the list that I entered are forwarded.
I specified the exchange server IP in []'s for each remote forwarded domain.

ALL email is forwarded now.

I have not installed virus or Spam filtration software on the forwarder.

All seemed fine, until I realized that all INBOUND emails with a
"return-path: <>" in the header are being dropped in BADMAIL.

I look on the event log of the forwarder, and see:
=====================================
Event Type:     Warning
Event Source:   smtpsvc
Event Category: None
Event ID:       4000
Date:           1/28/2003
Time:           6:16:54 PM
User:           N/A
Computer:       MAILGUARD
Description:
Message delivery to the remote domain 'conway.com' failed for the following
reason: Unable to successfully connect to the remote server.
 
Data:
0000: 3a 02 04 c0               :..À    
=====================================

This happens once for every message with a "return-path: <>" in the header

Further research revealed that these messages are NDRs from AOL but MOSTLY
messages from List servers.

We NEED to get these emails!!!

So, here's what testing I have done..

If I drop these messages into the PICKUP folder, they get delivered.

I telnetted into the local host for the forwarder, sent a message from <> to
myself. It arrived.

I telnetted into the exchange server, sent a message from <> to myself. It
arrived.

(I am assuming these emails are the same as the ones that have a
"return-path: <>" in them.)

I send a message to the foreign list server with a command that makes it
reply, and it too lands in BADMAIL.

If email arrives from an exterior server with "return-path: <>" in the
header, it drops to badmail and I cant stop it.

What should I do?

Im completely stumped, and this has been going on for over a month now.

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