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http://techgenix.com/smtpdiagdiagnose-exchange-2003-smtp-dns/
Mar 10, 2005 · SMTPDiag issues DNS queries using UDP and TCP to validate that the queries will succeed. Note: Windows versions before Windows Server 2003 and Windows XP didn’t support UDP queries. If TCP queries fail, mail delivery will not successfull. SMTPDIAG sequence. Verifying Syntax Check the SOA record for the remote address domain
https://searchwindowsserver.techtarget.com/tip/Common-Exchange-mail-delivery-issues
Sometimes, however, unsavory Exchange server conditions arise that create message delivery delays or failures. In this article, I discuss some common culprits at the root of these problems. If you find yourself troubleshooting these issues, the first thing I recommend checking is your server's Microsoft Exchange MTA Stacks service.
https://social.technet.microsoft.com/Forums/exchange/en-US/a1eb469c-a528-4835-904e-0128be7a332f/outbound-mail-problems-in-exchange-2003
Oct 06, 2011 · 4) A check shows our Exchange server is on no blacklists, and has no DNS issues or reverse lookup problems. 5) The senders receive a Delivery Status Notification (Delay) not an NDR or NDN. 6) When outbound mail is sent, looking at Queues in System Manager shows the creation of an "SMTP SmallBusiness Connector - <recipient mail domain> (SMTP ...
http://msexchangeguru.com/2013/07/29/troubleshooting-mail-flow-issues/
Mail being blocked at Exchange 2003 server: In case of mail being stuck at the exchange server, we follow these steps: Use the exchange system manager to check the queue. Check the additional information for the queue where the mail is being blocked. Additional Information can be found on the bottom left corner of the exchange system manager.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-4-4-7-in-exchange-online
The number of delivery attempts made that were made by the datacenter server in Exchange online, and how long it tried to reach the remote server. The email admins in the destination domain will need to investigate the issue.
https://conetrix.com/blog/exchange-2003-local-delivery-queue---fixing-an-email-stuck-for-one-user
Aug 16, 2012 · Some investigating seemed to point to a problem with the user’s mailbox, and that we would need to rebuild the user’s mailbox. I exported all of the user’s mail to a PST file, deleted the mailbox, recreated the mailbox, and imported the PST file …
https://social.technet.microsoft.com/Forums/en-US/7b4fb5d0-8251-4b6d-a75f-1d43e93b03b7/local-delivery-queue-does-not-deliver-for-one-user-on-the-sbs-2003-box-running-exchange-2003
Sep 15, 2011 · Local Delivery Queue does not deliver for one user on the SBS 2003 Box running Exchange 2003. ... Exchange Previous Versions - Mail Flow and Secure Messaging https: ... (the one with the user is identified) – it then tells me there are no known delivery queue issues, checking distribution group extensions – no critical distribution group ...
https://community.spiceworks.com/topic/250042-microsoft-exchange-server-2003-slow-mail-issue
Aug 10, 2012 · We are having a problem with Exchange 2003 Enterprise where internal and external mails being sent or recieved are delayed anywhere from a few hours to a few days. About 80% of the messages are delayed the rest seem to be delivered normally.
https://www.experts-exchange.com/questions/24237577/Exchange-2003-delivery-problems.html
All of a sudden one of the Exchange 2003 servers that I manage is having delivery problems to certain domains. It appears that it is only to other Exchange servers. I have checked the RBL's and the server is …
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