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Exchange problem. Non-Delivered Report (NDR) Generated for one particular sender address.


We are running Exchange 2000 on MS Server 2003. Recently, one of our employees told me that he can't receive emails from one of our clients from whom he was able to receive emails before. I've controlled exchange message tracking and found out the following records for this sender:

SMTP: Message submitted to advanced queuing.
SMTP: Started Message Submission.
SMTP: Message submitted to categorizer.
SMTP: Message categorized and and queued for routing.
SMTP: Non-Delivered Report (NDR) Generated.

I've done a test on DNSSTUFF and it revealed several FAILs and WARNINGs for the sender's domain. However, that sender is still able to send emails to other recipients not in our domain. However, DNSSTUFF for our domain passes all tests without failures except some warnings.

What could be the reason and how can I set up my exchange to still receive emails from this particular sender?

Thank you
2 Solutions
Ask the sender IT admin to try sending mail to your domain through telnet and see what error pops up
What are the errors for his domain in DNSStuff, what warnings do you get, and what anti-spam/anti-virus are you using?
ZaurbAuthor Commented:

Trying to connect to all mailservers:

   mail0.spidernet.net. -  [Could not connect: Got an unknown RCPT TO response: 451 4.7.1 Greylisting in action, please come back later
   mail1.spidernet.net. -  [Could not connect: Got an unknown RCPT TO response: 451 4.7.1 Greylisting in action, please come back later
   mail2.spidernet.net. -  [Could not connect: Got an unknown RCPT TO response: 451 4.7.1 Greylisting in action, please come back later

We use CA Antivirus with eTrust Antispam.

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ZaurbAuthor Commented:
And one more question, if the email is listed in the exchange message tracking as I've described above, is it possible to recover such email somehow?
ZaurbAuthor Commented:

I still continue seeing emails in Exchange which are blocked and do not reach final recepient in our domain. Email which is sent from other domains (not all, but some emails) are processed by exchange but do not reach the final recepient. How can I unblock these emails?
Any suggestion? Thanks!
ZaurbAuthor Commented:
i've resolved theissue myself. it was a dns issue.
What was the DNS Issue??  I am having the same exact issues.
ZaurbAuthor Commented:
The problem was with the dns of the sender, not in our site. So can't say exactly. I've received confirmation on that from othe provider.

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