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My IP Being blocked by CSI Cloudmark but no one else?

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#1 ClearFocus


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Posted 19 July 2012 - 02:29 PM

I am a Web Host and have a few companies hosted for their websites and email. Twice now, once my email and once recently a clients, undeliverable email has returned mentioning SMTP Error and RBL Restriction with my server's IP address. I'm on a VPS server.

Here's an example of the most recent one

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

SMTP error from remote mail server after initial connection:
host mx.insight.synacor.com []: 550 5.7.1 RBL Restriction:
- <> - See http://csi.cloudmark.com/reset-request/?

When this happened to me, I went to http://csi.cloudmark.com/en/reset/ and submitted my information to have my IP removed from their list. I checked all the other blacklists and I was not on any of them. I read thru Cloudmark's FAQ stating that my IP may not be on any other list, blah blah blah. Shortly after my submission my outgoing email started working again.

Then, I find out today that one of my clients is receiving similar returned email messages (see the one above). I submitted the request once again. But, I'm perplexed. I only have maybe 10 clients on my host server and myself. I know none of my clients are spamming. What can I do to help eliminate the problem overall?

Any help is greatly appreciated.

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#2 noknojon


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Posted 30 July 2012 - 05:40 PM

Cloudmark Sender Intelligence™ (CSI) is a comprehensive global sender monitoring and analysis system that delivers timely and accurate reputation on good, bad, and suspect senders. CSI uses real-time data from Cloudmark's Global Threat Network™ system to create the industry's most comprehensive sender reputation service
If you believe the reputation of your IP address is not correct or if the reputation has changed, you may request a reset of all related email traffic statistics within CSI for your IP address.

Purely based on the link that you sent us, your only action can be to contact the people at Cloudmark Sender Intelligence.
You may not send spam, but do you have advertising of any kind contained on your site that may be forwrded with an email ??
This can often be a reason for the blocks -

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