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SMTP delivery problem


SMTP delivery problem Bill H
11/8/2006 12:57:52 AM
iis smtp nntp:
I've set up a Win 2K3 machine with the SMTP service running for outgoing
mail only. This machine serves as a development machine for .NET, several
databases, and software. The machine name is "asiolywadev" and the fully
qualified domain name "asiolywadev.mydomain.net" is defined in SMTP's
virtual properties. This machine resides at my location.

We do have a valid MX record defined for our mail.mydomain.net mail sever at
a completely different IP address at a different location in another state.

The billing package builds an email and writes it to the "\mailroot\Pickup"
directory. The email includes a CC: address. All seems to work fine except
for some email addresses. In testing, att.net wouldn't accept email and it
just sits in the queue, although the email was delivered to the TO: address.
When I switch the addresses the att.net address never gets delivered.

A look at the event logs show:

+-----------------------------------+
Message delivery to the host '12.102.240.23' failed
while delivering to the remote domain 'att.net' for the
following reason: An SMTP protocol error occured.
+------------------------------------+

The header of the email, built by the dbms application, looks like:

Received: from mail pickup service by asiolywadev.mydomain.net with
Microsoft SMTPSVC;
Wed, 8 Nov 2006 00:30:37 -0800
Date: Wed, 08 Nov 2006 00:30
From: support@mydomain.net
Subject: Statement from LAKEWOOD VIEW TWNHOME ASSN
To: myaddress@mydomain.net
Cc: myaddress@att.net
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Message-ID: <ASIOLYWADEVFRaqbC8w00000003@asiolywadev.mydomain.net>
X-OriginalArrivalTime: 08 Nov 2006 08:30:37.0156 (UTC)
FILETIME=[2A8C8240:01C70310]

I ran the SMTPDiag tool and get:

C:\Documents and Settings\me>d:\utilities\smtpdiag\smtpdiag "myaddress@my

domain.net" "myaddress@att.net" /v



Searching for Exchange external DNS settings.

Computer name is ASIOLYWADEV.

Failed to connect to the domain controller. Error: 8007054b



Checking SOA for att.net.

Checking external DNS servers.

Checking internal DNS servers.



Checking TCP/UDP SOA serial number using DNS server [4.2.2.2].

TCP test succeeded.

UDP test succeeded.

Serial number: 143

SOA serial number match: Passed.



Checking local domain records.

Starting TCP and UDP DNS queries for the local domain. This test will try to

validate that DNS is set up correctly for inbound mail. This test can fail
for

3 reasons.

1) Local domain is not set up in DNS. Inbound mail cannot be routed to

local mailboxes.

2) Firewall blocks TCP/UDP DNS queries. This will not affect inbound
mail,

but will affect outbound mail.

3) Internal DNS is unaware of external DNS settings. This is a valid

configuration for certain topologies.

Checking MX records using TCP: mydomain.net.

MX: MAIL.mydomain.net (10)

Checking MX records using UDP: mydomain.net.

MX: MAIL.mydomain.net (10)

Both TCP and UDP queries succeeded. Local DNS test passed.



Checking remote domain records.

Starting TCP and UDP DNS queries for the remote domain. This test will try
to

validate that DNS is set up correctly for outbound mail. This test can fail
for

3 reasons.

1) Firewall blocks TCP/UDP queries which will block outbound mail.
Windows

2000/NT Server requires TCP DNS queries. Windows Server 2003 will use UDP

queries first, then fall back to TCP queries.

2) Internal DNS does not know how to query external domains. You must

either use an external DNS server or configure DNS server to query external

domains.

3) Remote domain does not exist. Failure is expected.

Checking MX records using TCP: att.net.

MX: gateway2.att.net (5)

MX: gateway1.att.net (5)

Checking MX records using UDP: att.net.

MX: gateway1.att.net (5)

MX: gateway2.att.net (5)

Both TCP and UDP queries succeeded. Remote DNS test passed.

A: gateway2.att.net [12.102.240.23]

A: gateway1.att.net [204.127.134.23]



Checking MX servers listed for myaddress@att.net.

Connecting to gateway1.att.net [204.127.134.23] on port 25.

Received:

550 unauthorized interface for 67.160.83.167 on mtiwmxc16



Error: Expected "220". Server is not accepting connections.

Failed to submit mail to gateway1.att.net.

Connecting to gateway2.att.net [12.102.240.23] on port 25.

Received:

550 unauthorized interface for 67.160.83.167 on mtiwmxc18



Error: Expected "220". Server is not accepting connections.

Failed to submit mail to gateway2.att.net.




So, there seems to be some kind of problem with ATT.NET accepting email from
our development server. I can't figure out why? Our production servers,
running on Linux and using sendmail from within the local network where our
corporate mail server resides, are able to send billings with CC:s to my
att.net address without problems.

Can anyone help?

Thanks,

Bill

Re: SMTP delivery problem KL
11/8/2006 11:20:43 AM

http://forums.openhosting.com/viewtopic.php?p=708&sid=03a058d3793cb255c73178cae11763bc

Seem to some weird blocking they are using. Apparently they think it's funny
to to try and cause trouble instead of showing an error message when they
block.

Your best bet is trying to contact them and ask them about this.

KL.


"Bill H" <you@notreally.com> skrev i meddelandet
news:RYKdnRMaovCOAczYnZ2dnUVZ_qGdnZ2d@comcast.com...
[quoted text, click to view]

Re: SMTP delivery problem Bill H
11/8/2006 5:51:46 PM
I'm checking with AT&T right now. Hopefully they'll come up with an answer.

Thanks,

Bill

[quoted text, click to view]

Re: SMTP delivery problem Bill H
11/16/2006 9:37:09 AM
It seems AT&T requires any email sent to them be legitimate. Their
definition of legitimate is:

1) The "FROM:" address domain has to have a valid MX record associated with
it; mail.mydomain.com will work fine for me@mydomain.com.
2) The IP address that the email is originating from has to match the main
address of the A record for the above domain.

So, my development SMTP server sent the email from 67.123.123.123 using the
"FROM:" address of me@mydomain.com. However, the MX record for our company
points to mail.mydomain.com and our A record for mail.mydomain.com points to
IP address 209.123.123.123. Therefore, any emails from me@mydomain.com must
come from an IP address of 209.123.123.{whatever}.

[quoted text, click to view]
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