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Block List

I have Microsoft Exchange 2007 running smothly but lately I have been receiving complaints from a few employees that certain outside users cannot send them email. They receive this message

"550 5.7.1 Recipient not authorized, your IP has been found on a block list (in reply to RCPT TO command)

Is this problem on my exchange server? How can fix this?

SOLUTION

Burns2007

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Dennis Janson

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I ran through the check and neither there or my domains are on any black list according to the mxtool. I did get there IP address from there and added it to the IP allow list on the edge server. Maybe that will work?

leakim971

Hello GMSMRM,

It's not your IP which is blacklisted but the mx of the outside users.
You need to add their MX IP or their email in YOUR whitelist (IP allow list filter and sender filtering filters) : http://www.allspammedup.com/2009/01/managing-whitelists-and-blocklists-for-exchange-server-environments/

Regards.

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leakim971

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SOLUTION

shauncroucher

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Dennis Janson

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I did get the IP address and add it to mt IP allow list and now was able to receive email from that account. However before I assign points I found that Shauncroucher was correct where I looked up the MX record again and I received a different IP address. I looked up that one on the blacklist and it did appear on the "FIVETEN" black list. So most likely this will be blocked again. Is there a way to allow a domain on the IP list? OR get them off of the black list?

shauncroucher

If the IP is on the blacklist then it will be important for them to be removed.

You can email FIVETEN, go to their website and it gives instructions on how to get removed from the list.

You can whitelist a whole domain yes, see here:http://exchangepedia.com/blog/2007/01/exchange-2007-content-filter-whitelist.html

Shaun

Dennis Janson

ASKER

Thanks for al your help. I had to divide points because you all gave steps I needed to resolve the problem. I found the IP and Blacklist issues from the MX toolbox website. I needed add the IP to the allow list as well as the domain in the IP allow list providers. Thanks.

leakim971

Thanks for the points and see you soon! Merry Christmas!