This isn't the first time the topic of deliverability in the B2B (business-to-business) email realm. Back in June, I answer the question, "Is B2B Deliverability Different?" In a more recent blog post, I link to information from Google about how they've become a very large host of B2B mailboxes.
Clearly, Google is a big player in this space. Meaning, a lot of the B2B mailboxes you send to are going through spam filters run by Google; just as if your recipients were at Gmail.com. What that means to you is that the same rules apply to sends to both those Gmail.com users and any B2B domains hosted at Google.
As I mentioned before, Yahoo, Hotmail and Google host mail for more than 264,000 domains, Google making up approximately 106,000 of those domains. (All three of these guys probably host mail for very many more domains than this; this is just a snapshot based off of last year's client list data. Meaning, if a domain doesn't show up on an email list, I don't know about it.)
That means you've got a huge chunk of the B2B email space hosted by top consumer webmail providers. Meaning that the B2C rules significantly apply to B2B senders, by the fact that the same spam filters are involved.
In the more specific B2B realm, there are too many players to list. Postini, Cloudmark, Barracuda, Ironport, Symantec Brightmail and MessageLabs are just a few of them. There are hundreds, maybe thousands more.
The way these filterers work is very similar to how B2C ISP spam filters work. They build a reputational view of you based on spam complaints, engagement, bounce rates, etc. They're a bit more invisible to some senders, as it's not always easy for you to know exactly what % of your mailing list might be behind a Brightmail filter, for example. But they still matter, very much so. In this combination of hosted service providers and appliance developers, getting tagged as a bad guy means you end up with delivery problems far and wide.
If you end up with a bad reputation as measured by Barracuda, and your mail is going to be blocked or filtered at the more than 85,000 customers that use Barracuda spam-filtering devices.
If Cloudmark determines the mail you send merits a bad reputation, you'll probably find it hard to successfully get to the inbox at any mailbox protected by any of Cloudmark's anti-spam solutions -- that's over 850 million mailboxes in 190 countries!
That's why B2C and B2C are more similar than you might have thought. Filterers handling either type of mail both look at your sending reputation, and treat your mail acordingly. Blocked at any of these providers on either side of things means that you're going to have issues delivering mail to a whole bunch of different mailboxes.


Drip marketing comes from the phrase drip irrigation, which is where crops are watered in small amounts over a long period of time. This same concept is applied to marketing and is called drip model marketing. Customers or potential customers are given small amounts of information over a long period of time.
In case you missed it, here is the Top 5 round-up of ExactTarget's best blog posts from last week:
I was driving along the interstate last week when I noticed a billboard alongside the road. In big, bold letters it read: "Measure Your Advertising ROI By the Square Foot". Suddenly the difficulties of advertising in print media took on a whole new light. Advertising on paper is a very difficult task. You can't measure impressions, you can't track data, and it's almost impossible to follow the path of your customers through the buying cycle. In the end, it comes down to a guessing game paired with a hopeful strategy. So what can marketers do to target their audiences and to track relevant information? I'm glad you asked.
Last week I talked about
Recently, I had the opportunity to talk with Aptera’s co-founder, TK Herman and Brooke Francesi, who heads up email marketing for company. One of the things that impresses me about Aptera’s email strategy is their “less is more” philosophy regarding the size of their email subscriber database. As Francesi points out, “We’ve learned that it is far better to have a smaller list of highly engaged subscribers who want to hear from us than it is to have a big list of people who are passive.” As evidence of this commitment to list quality, Aptera’s list of subscribers for its quarterly newsletter is a lean 2,600. And the list of subscribers for Aptera’s monthly newsletter for users of Aptera Scorecard, a web-based firm management tool designed to meet the needs of a variety of Professional Services firms, is 15,000.
Both Herman and Francesi are quick to point out that, in addition to keeping their email subscriber list clean, the other big keys to their success in B-to-B email marketing are engaging content and engaging design. As TK Herman says, “If you provide information that is of value to the subscriber, and deliver that content in a newsletter that is attractive, you’ll generate response.”
Being an avid participant in the social media sphere - I’ve found myself subscribing to more and more email. (So much for email being dead!) I generally keep a separate email for these opt-in’s and check in once a week to see what cool things other companies are doing with their email marketing.
In case you missed it, here are the Top 5 most requested ExactTarget blog posts last week:
Sallie Anthony is one of the smartest email marketers I know. As Field Communication Manager for the Retirement & Protection division of 
