Blocked Email Part 2: “Now what do I do?”
In Part I, we talked about a few of the possible reasons that your email might be blocked. Today, we’ll talk about things that an individual end-user can do when they receive one of those dreaded...
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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...
View ArticleBack 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,...
View ArticleThe importance of being identifiable
One of the technical pitfalls that many senders face surrounds the rDNS of an IP address. rDNS (also referred to as reverse DNS or a PTR record) is the friendly hostname that an IP address maps to and,...
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