RE: Client Can Send But Cannot Reply
From: Darin Roulston [MSFT] (darinr_at_online.microsoft.com)
Date: 12/29/04
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Date: Wed, 29 Dec 2004 16:10:17 GMT
Hi Jose,
That is an odd one. I have a couple of questions to help in trying to
isolate the problem.
1.) Are there any firewalls involved between SMTP clients/servers that may
be blocking authentication needed for successful relay?
2.) Are the Outlook clients in corporate mode, Internet mode or both?
3.) In the non-delivery report the client recieves, which server is listed
as issuing the NDR, the Exchange server or another server?
4.) Do you have any antivirus, spam filtering etc that could be hooking
into SMTP or taking over SMTP port on the Exchange server?
If the client (Outlook 2003) is always sending via SMTP and is always
pointing to the same SMTP relay server (Exchange) then the relays should be
equal (a reply vs a new message). A network monitor trace may be a good
place to start if this is the case to see exactly what is occurring in the
SMTP conversation. I.e. are we talking to the same server in both cases?
Are we issuing the same sequence of commands or is an auth login perhaps
missing in one of the conversations then begin looking closer based on what
you find.
Darin Roulston
Microsoft
-- Get Secure! - www.microsoft.com/security -- When responding to posts, please "Reply to Group" via your newsreader so that others may learn and benefit from your issue. -- This posting is provided "AS IS" with no warranties, and confers no rights. ========================================================== -------------------- Thread-Topic: Client Can Send But Cannot Reply thread-index: AcThys8aof5GqKQyS66tmMH6h260iQ== Scenario : Exchange 2000 Server on a Windows 2000 Server Active Directory. AD domain is : agence.a-b.com Public domain, given by the ISP is : ab.com All eMAIL adresses for users in the AD have been set as follows : joe@ab.com (you see, we are using the public domain) Exchange Client is : OutLook 2003. Users can send and receive eMAIL internally (nice). Users can send and receive eMAIL to and from Internet (nice). PROBLEM Users cannot reply the eMAILS they have received form Internet. When a user tries to reply an SMTP eMAIL he has received from Internet, automatically and immediatly he receives a NDR message : 550 5.7.1 Unable to relay for name@domain.com. name@domain.com is the Reply To Adress of the persons that has sent the original message we are trying to reply. I confirm users can sent with no problems to Internet, but they cannot reply. And tehy can send, receive and reply internal (Global Adress List) eMAILs. Any idea ? Thanks !!! PEP
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