NDR Status 4.4.7 When Emailing Certain Domains

NDR Status 4.4.7 When Emailing Certain Domains

Post by Matt Wood » Fri, 16 Jan 2004 04:11:43


When accounts in my domain try to send email to a few
specific external domains the emails time out in the mail
queue with an NDR status 4.4.7.

When I looked this up in the KB it says the message timed
when trying to communicate with the receiving mail server.

But I know the mail servers are not down because I sent an
email from a personal email account to the domain which
got through.

Any ideas what the issue could be?

Also, I experienced a similar issue with an Exchange 5.5
server which I solved by configuring the IMS to reroute
outbound messages sent to the problematic domains through
an ISP's SMTP server. Is there a way for me to do this
with Exchange 2000? Maybe in the SMTP virtual server.

Thanks.

Matt
 
 
 

NDR Status 4.4.7 When Emailing Certain Domains

Post by Alexander » Fri, 16 Jan 2004 05:26:55

This message usually indicates a problem on the receiving server. Check the
validity of recipients address as well as whether the receiving server is
configured to receive messages correctly. Resending the message will place
it again in the queue, if the receiving server is up and configured
correctly, message delivery should succeed unless the receiving server has a
policy to reject mail from your domain/ip (i.e. based on DnsBL) so make sure
it is not blacklisted. You can create a connector (SMTP connector to the
address space in question) that will relay through some other mail server
(you need to be able to relay through it), i.e. send all the mail to these
domains through another IP.


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Please do not send email directly to this alias. This alias is for
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NDR Status 4.4.7 When Emailing Certain Domains

Post by anonymou » Fri, 16 Jan 2004 08:57:10

Thanks for the advice.

Its so wierd because I can send email to the same domains
from a personal email account. I can also telnet to the
problematic mail servers from my mail server on port 25.

Also, I've been to a few of the major blacklist sites and
looked up our domain in their databases without finding a
record. So I'm pretty sure we have not been blacklisted,
plus normally when you are blacklisted it will indicate
that in the NDR, but these NDR's just state that the
message could not be delivered in a timely manner #4.4.7.

I need Robert Stack to put this one on "Unsolved
Mysteries".


server. Check the
receiving server is
message will place
configured
receiving server has a
DnsBL) so make sure
connector to the
other mail server
the mail to these
confers no rights.
alias is for
in message

mail
timed
server.
an
through
 
 
 

NDR Status 4.4.7 When Emailing Certain Domains

Post by Alexander » Sat, 17 Jan 2004 02:35:13

att, have you tried to submit mail using telnet (not just connect to port
25 but send mail to it)? Also taking a netmon sniff of the smtp
conversation would help to narrow the problem down.

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Please do not send email directly to this alias. This alias is for
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< XXXX@XXXXX.COM > wrote in message
news:0c8401c3dafa$1fa63010$ XXXX@XXXXX.COM ...