Just yesterday a group of delivery folks were discussing email verification services over IRC. We were talking about the pros and cons, when we’d suggest using them, when we wouldn’t, which ones we’ve worked with and what our experiences have been. I’ve been contemplating writing up some of my thoughts about verification services but it’s a post I wanted to spend...
In the email delivery space there are a lot of numbers we talk about including bounce rates, complaint rates, acceptance rates and inbox delivery rates. These are all good numbers to tell us about a particular campaign or mailing list. Usually these metrics all track together. Low bounce rates and low complaint rates correlate with high delivery rates and high inbox placement. But sometimes the...
Often clients come to me looking for help “removing spamtraps from their list.” They approach me because they’ve found my blog posts, or because they’ve been recommended by their ISP or ESP or because they found my name on Spamhaus’ website. Generally, their first question is: can you tell us the spamtrap addresses on our lists so we can remove them? My answer is...
There are a number of folks who tell me there can be no zombie addresses on their lists, they aggressively remove any address that bounces. The problem is that zombie addresses don’t bounce, at least not always. And even when ISPs say they have a policy to bounce email after a certain period of time with no access, that’s not always put into practice. How do I know that ISPs...
I can’t add much more to Steve Denner’s article about building list size.
People get into all sorts of details when talking about best practices. But so much of email depends on the type of email and the target market and the goals of the sender. It’s difficult to come up with universal best practices. I’ve said in the past that I think that best practices are primarily technical. I don’t believe there is a best frequency or a best time to send mail...
In the comments Ulrik asks: “How can unengaged recipients hurt delivery if they aren’t complaining? What feedback mechanism is there to hurt the the delivery rate besides that?” There are a number of things that ISPs are monitoring besides complaint rates, although they are being cautious about revealing what and how they are measuring things. I expect that ISPs are measuring things...
Every sender, big or small, should have the ability to suppress sending to any particular email address. They must, absolutely, be able to stop sending mail to anyone for any reason. Not only is this a legal requirement in every jursidiction that has laws about email marketing, it’s just good business sense. What happens when marketers fail to be able to suppress email addresses? At some...
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