Question

Sender's messages getting bounced back

Asked by: Cappper

Sender: joe@xyz.com
Recipient: sam@abc.com

abc.com is one our clients and intermittently users are unable to send them a message. abc.com is running Exchange in house.
Example.
Everytime joe@xyz.com tryies to send a message to sam@abc.om joe gets the following bounce back.
-- The original message was received at Wed, 12 Sep 2007 12:38:10 -400 (EDT)
-- From intinamsmtp20.nam.pwcinternal.com (10.26.104.87)
--
-- --The following addresses had permanent fatal errors
-- <sam@abc.om>
--
--- -Transcript of session follows
-- 451 4.3.5 Error getting LDAP results in map ldapmra: Cant contact LDAP server
-- <sam@abc.om> &Deferred: Name server: abc.om.: host name lookup failure
-- Message could not be delivered for 1 day
-- Message will be deleted from queue

The thing is... nobody else at xyz.com has a problem sending to sam@abc.com.  Only joe@xyz.com
This is happening intermittently with a couple people at different companies.

Any ideas would be great.

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Asked On
2007-09-14 at 14:31:11ID22830147
Tags

error

,

ldap

,

getting

Topics

Exchange Email Server

,

Email Software

,

Email Clients

Participating Experts
2
Points
500
Comments
7

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Answers

 

by: GeoSsPosted on 2007-09-14 at 15:02:21ID: 19895421

Do you or the abc.com run any spam filtering sollution that uses LDAP to identify valid e-mail accounts ?
Might be the SMTP relay server or the spam filter trying to do a LDAP lookup on the SAM@abc.com user and it fails to get a valid result.
What e-mail server is xyz.com running ?

 

by: CappperPosted on 2007-09-14 at 15:20:48ID: 19895506

abc.com does not run any spam filtering at the moment.  We will be moving them to a solution shortly but as of now... no.
ZYX.com is actually PriceWaterhouse Coopers.  I am not sure what they are running for email servers but I would image it is an enterprise solution.  Exchange most likely.

 

by: GeoSsPosted on 2007-09-14 at 15:39:11ID: 19895580

Do you have any recipient filtering enabled on the Exchange ?

 

by: infinPosted on 2007-09-15 at 01:16:26ID: 19896886

That appears to be a problem with LDAP configuration on sendmail, which is what a lot of enterprise organisations still use for their mail servers.  Unfortunately (or fortunately), it's not a problem with the abc.com mail server.

 

by: CappperPosted on 2007-09-17 at 08:02:19ID: 19905487

Why then are other users from xyz.com able to send mail to abc.com but this one particular user can not not?

 

by: GeoSsPosted on 2007-09-17 at 08:11:43ID: 19905552

Maybe because this user has some special permissions set ??? Try to compare the security on this user in AD with another user.
Do you see any differences ? Exchange atributes differences ?

 

by: CappperPosted on 2007-10-25 at 09:45:12ID: 20149078

This was never resolved.  Thanks for trying.

20120131-EE-VQP-002

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