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Better Blacklisting and Safelisting

A couple of weeks ago we blogged about some of the improvements we’re in the process of making to our anti-spam system. Today we released the first round of those improvements.
In this release, our safelisting and blacklisting systems got an overhaul. Previously, when users added addresses to their safelist, mail from that sender could still get blocked. This was because the safelist rules were used in the spam content filter part of our system (SpamAssassin), but not in the Postfix system that attempts to reject spammer SMTP connections. Also, mail from blacklisted senders would get tagged as spam and delivered to the spam folder, rather than getting blocked outright by Postfix.
Now all of this takes place within Postfix. Email from senders that are on the recipient’s safelist will never get rejected by Postfix, and email from senders that are on the recipient’s blacklist will always get rejected by Postfix.
Thanks to Mike T., our new anti-spam guru, for knocking this out.
Now we begin work on the next phase… letting customers add IP addresses to their safelists and blacklists. Stay tuned!

About the Author

This is a post written and contributed by Pat Matthews.

Pat Matthews is the Senior Vice President of Corporate Development at Rackspace. Prior to Rackspace, Pat founded, a business email hosting company that made Inc. magazine's list of the fastest-growing private companies in America. In 2007 Rackspace acquired and the two businesses joined forces. From 2007 to 2009, Pat led the Rackspace mail business and helped grow it to more than two million paid mailboxes worldwide.

In January 2010, Pat was promoted to Vice President and General Manager of all Rackspace cloud businesses. In this role he led Rackspace to become one of the most important companies in the cloud computing industry. He was promoted to Senior Vice President of Cloud at Rackspace in August of 2010.

Today, Pat oversees corporate development, which includes M&A, investment projects, new business initiatives and strategic partnerships.

Pat is a graduate of Virginia Tech. He is an angel investor and advisor in several startup companies. Pat and his family live in San Antonio, TX.

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