Cloudmark is now part of Proofpoint. Learn More

About Proofpoint

Tag Archives: Deliverability

Email Blacklists and Cloudmark’s Sender Intelligence (CSI)

Return Path Infographic Return Path recently published an infographic guide to public email blacklists.  As the infographic explains “Public email blacklists are lists of IP Addresses and domains that have been reported and listed as “known” sources of spam.” These lists are used by both large email box providers and enterprises to make decisions about […]

Reputation is a function of permission

So Mr/Ms Marketeer, you have everything in order.  You have a 400k address list, you’ve hired an ESP to make sure all the basics are in order, you’re authenticated and CAN-SPAM’d up to the eyeballs, and it’s time to market but … WHAM! your messages end up hitting the spam folder. Sound familiar? Surprised? I’m not. […]

Back to Basics – email deliverability

While there are many methods by which email messages can be blocked (for example, DNSbl listings can results in IP addresses being refused connections, subject lines could match previously seen spam, or URLs or email addresses in the body might trigger a receiver’s content filters), there is one main reason that filters to the top […]

2009 Spam Highlights

As the end of the year draws near, we wanted to highlight some of the spam methodology and attacks Cloudmark observed over the past year. Snowshoe/hailstorm attacks: Snowshoe spam is a campaign which is distributed across multiple IP addresses within a /24 netblock (256 IP addresses) and migrates through large portions of a /16 (65,536 […]

Learn More About Cloudmark
Our Products
News and Events
Site Map  •  Privacy Policy  •  ©2002–2019 Cloudmark, Inc.