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Maximizing Deliverability
Spencer Kollas Director of Deliverability Services
December 11, 2007
The Deliverability Face Off: Reputation vs. Content
As an email deliverability consultant, I often get asked what affects deliverability more – reputation or content? This is a good question; unfortunately the answer isn't so straightforward. In fact, it really depends.
If you have a poor sender reputation it won't matter what your content looks like, because it probably won't get to your customer's inbox. On the other hand, if you have a good reputation, but your content is getting caught by every anti-spam software available, your customer still won't get your message.
To answer the question, it helps to start at the beginning. Imagine that you are setting up a brand new mailing system and are going to start sending email off of new IP addresses. What would you focus on first? Hopefully, you answered "reputation," because that's exactly where you should be focusing your attention at this stage of the game. The fact is that many receivers do not trust new IP addresses and will view you as guilty until proven innocent. That being said, you need to build a positive reputation with the receivers, and you do that by starting SLOWLY.
When building a new reputation on a new system, make sure to send smaller segments of your list and test them to make sure that they are getting through. As you continue to see positive delivery rates, you can increase the percentage of your list that you are mailing until you get to full production. By doing this in a very iterative-type approach, you allow the receivers to look, assess and put a formal (hopefully) positive reputation on your new system.
Remember that during this time you want to send to your best and most active customers. By doing this, you are less likely to see the complaints or unknown users that can quickly put a negative affect on your reputation.
Once you have a positive reputation for your mailing system, you should make sure that your content is not causing you any issues. There are many ways to do this, but the most important one is to test. There are plenty of tools available to test your messages against the most common anti-spam software. By testing, you will be able to tell if your content might case a delivery issue. Also, remember to follow best practices like a good HTML-to-Text ratio, personalization of the content in the message and steering clear of commonly used SPAM words.
Posted by: Spencer Kollas at 11:58 AM
Categories: Deliverabillity
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The successful delivery of email campaigns requires both a solid sender reputation and content that is designed to pass the anti-spam filter litmus test(s). Attention to both of these elements is required to realize good delivery rates. In his article,... Read More

This is great advice; however, it raises a question. If you are only mailing your active subscribers initially to build reputation, should you also be mailing the rest of your list through another mailer/network? I would think that once your reputation is solid enough such that a majority messages are landing in the Inbox and you slowly begin to mail the rest of your list, the subscribers who have not been receiving messages will be more likely to complain (especially since they have not been engaging in the first place).
There may not be an exact answer for this as items such as mailing frequency, brand recognition, brand loyalty, type of business, etc. all come into play; however, I would like to hear your thoughts on the matter.
Comment by Justin – December 15, 2007 9:08 AM
You are correct all of those things do come into play, and I would suggest sending the "less then perfect" list of senders off a separate system until you have built up your new one. Many times companies can still send with their old ESP until they get their new IPs up and running.
Comment by Spencer – December 17, 2007 6:52 AM
Thinking like a programmer (which I am) I would say, to someone asking that question, it's not an "OR" but rather it's an "AND"
You could compare it to plugging a floor lamp into an outlet which is wired to a wall switch. If either the switch on the wall or the switch on the lamp is OFF, there's nothing you can do /at the other switch/ to turn that light on.
Comment by bob – January 8, 2008 12:49 PM
I completely agree Bob--it is both
Comment by Spencer – January 8, 2008 12:55 PM