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Error 421 4.7.1 Recipient address rejected: <Backup mail exchanger not provided here> #SMTP#

Hi All,

I'm having problem in sending email to one of my recipient, he can send and receive with any other system but somehow only my email address got blocked or rejected ?

See the following error message:

Can anyone help me please ?

Your message wasn't delivered because of security policies. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator.

The following organization rejected your message: mailin1.pacific.net.au.

mailin1.pacific.net.au #<mailin1.pacific.net.au #4.7.1 smtp; 421 4.7.1 <my-friend@ntc.gov.au>: Recipient address rejected: Backup mail exchanger not provided here> #SMTP#

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3 Solutions
Alan HardistyCo-OwnerCommented:
Please have a read of my article that might highlight problems with your mail server setup, or a blacklisting somewhere.
If you find nothing worng, then it could be that the receiving server has you blocked for some reason.
If you find my article helpful - please vote for it!
That error code is also common when your smtp relay is on a blacklist for spam or bulk emails. based on the data you provided, I can see that (mailin1.pacific.net.au) was blacklisted on Backscatter.org on 3/14/2010., as well as several times in the past. I would try removing your server's IP from that blacklist and trying again after giving their server time to see the updated list.
Alan HardistyCo-OwnerCommented:
Backscatter.org only lists you if your mail server is configured incorrectly to send out Non-Delivery Reports to invalid recipients.
If you only have a single Exchange server, configure it to filter recipients and then you will not be sending out Backscatter.
Otherwise, please read the following:
jjozAuthor Commented:
Yes this is single server implementation.
Let me call the mail server administrator of that company. Because i don't have problem with any other company before.
Thanks for the reply guys.
jjozAuthor Commented:
Thanks man !
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