RE: Exchnage server publising by ISA causing some emails been rejected.
- From: Amy Babinchak <amy@xxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: "'[ISAserver.org Discussion List]'" <isalist@xxxxxxxxxxxxx>
- Date: Tue, 08 Apr 2003 09:33:23 -0400
Tom,
It actually has to do with a combination of dynamically assigned IP
address and using your own server for sending out email. They want those
people that have dynamically assigned IP address to use the server
provided by the ISP. From talking to them what they appear to have done
is take the ranges of IP's that are assigned to the major ISP's out
there and associated them with particular email servers. So if your IP
and server don't match they don't accept the email. Supposedly this is
an attempt to reduce spam. They say that people like me that use Comcast
with a dynamic IP and an Exchange server are likely spammers. - I'M
WRONGLY ACCUSED! I'M INNOCENT! - But no matter, I have to change my
email settings to send mail out through Comcast's server if I want my
mail to be delivered to an Earthlink customer. Fortunately I only have
one of those. It's a business client and Earthlink is about to lose them
to Megapath because of this. I understand what they are trying to
accomplish but replacing one annoyance with another is not acceptable.
Here's the message you get back from Earthlink with the bounced email
and the links that explain what they are doing. Although the message
also refers to open relay this was not the case on my server. Only the
dynamic IP applied.
There was a SMTP communication problem with the recipient's email
server. Please contact your system administrator.
<harbor.HCS.Local #5.5.0 smtp;550 Dynamic IPs/open relays
blocked. Write <openrelay@xxxxxxxxxxxxxxxxxxx>.>
Hello,
The reason that your mail bounced back is because it appears to have
attempted to pass directly from an IP address range believed to be
dynamically assigned (such as cable, dialup or ADSL) to the
EarthLink/MindSpring network), without first routing through an
appropriate SMTP server. This is known as "Direct to MX mailing", and
is a technique used by spammers to bypass spam control mechanisms
established by ISPs.
The following websites will help to explain the technicalities of what
is going on and how to alter your settings to correct the situation.
They are non-EarthLink resources.
<http://pan-am.ca/pdl/>
<http://www.mail-abuse.org/dul/enduser.htm>
<http://www.iis.se/Internetdagarna/idag2000/spam/maps/dul.html>
Amy
-----Original Message-----
From: Thomas W Shinder [mailto:tshinder@xxxxxxxxxxxxxxxxxx]
Sent: Monday, April 07, 2003 8:55 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Exchnage server publising by ISA causing some
emails been rejected.
http://www.ISAserver.org
Hi Amy,
Do you know if they are explitly denying inbound mail associated with
tzo and dyndns? I'm not sure how they would know, since the reverse
lookups on the dynamic ip address would not resolve to the ddns
provider, but to the ISP's reverse lookup zone, if they even keep one
for their dynamic addresses.
Thanks!
Tom
Thomas W Shinder
www.isaserver.org/shinder
ISA Server and Beyond: http://tinyurl.com/1jq1
Configuring ISA Server: http://tinyurl.com/1llp
-----Original Message-----
From: Amy Babinchak [mailto:amy@xxxxxxxxxxxxxxxxxxxxxxxxxx]
Sent: Monday, April 07, 2003 11:18 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] RE: Exchnage server publising by ISA causing some
emails been rejected.
http://www.ISAserver.org
Are you by chance hosted with Earthlink? If so, anyone sending you mail
from a non-static IP may have trouble depending on how they are
configured. This is a new attempt on their part to avoid spam.
Amy
-----Original Message-----
From: Martin Chen [mailto:martinhr@xxxxxxxxxxxxxx]
Sent: Monday, April 07, 2003 10:49 AM
To: [ISAserver.org Discussion List]
Subject: [isalist] Exchnage server publising by ISA causing some emails
been rejected.
http://www.ISAserver.org
Dear all,
Did anyone ever had a problem that some emails from specific domains
were always been bounced back. These domains can received email sending
from our server. But they can't send email to us. Some domains will get
a error message but some domain will receive nothing ( the email is gone
without any notice).
I'm using ISA sp1 ( I using the first version sp1 last year. Then I
found lots of mail been bounced back. Then I using newest sp1, it fix
some domains' emails. But not all of them.
My email server is Exchange 2k with sp2 and Win2k server with sp3.
Thanks!
Free Trial Software: Monitor & Manage Web Use with SurfControl Web
Filter for MS ISA Server http://www.surfcontrol.com/go/zisadl1
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