This post is for hard-core email marketers.
I want to talk about “email deliverability”—specifically, just how many of your emails get through to their intended destination and how do you know if your email provider is doing a good job. I’m not talking about basic metrics like “open rates” or “click-thru rates”. Nothing so basic.
Let’s take an industry segment that we know a little about. Travel.
The figures below relate to 5 travel companies (3 domestic airlines, 1 US based airline and 2 online travel portals). I’ll tell you how we sourced the data at the bottom of the post.
(Disclosure - we have a client Webjet, who we could have put into this comparison, but chose not to given that it would have been highly unlikely they would have wanted this data made public, even though it is essentially readily available). I think that makes sense.
As a side note, I will reveal that Webjet are way ahead of their local competitors, on par with the local airlines and everyone on this list lags Spirit Air)
Anyway.

What the table above shows is the various email providers used by the companies listed, the software used, the “sender score”, and the “deliverability” of their email as a percentage.
With this post, I’m not going to get into which email provider is better. That’s irrelevent for this conversation. Every company above will have their reasons for using their chosen vendor.
I will tell you upfront that it is highly unlikely that you will beat AWeber out of the US on cost or efficiency. We have a private label agreement with AWeber and this platform powers many of our existing clients email requirements. However, they do have their limitations.
Let’s look at each airline.
Virgin Blue uses an internal application, meaning in all probability, they have their own application running off their own servers. This is unusual. Their sender score is very good, but their “deliverability” leaves a lot to be desired.
Qantas and Jetstar (the same parents) use a solution provided by eServices (which is a part of the Clemenger Group). Qantas has a very good sender score and deliverability number. And you’d expect this, given the size of their frequent flyer databases and the sheer volume of email they send. On the other hand, Jetstar has a woeful sender score but good deliverability.
Let’s come back to Spirit Air (US based) in a minute.
On to Flight Centre and Travel.com.au. Both these providers use external email providers; Flight Centre uses the well-regarded Accucast, and Travel.com.au the aging DARTmail (formerly part of online ad group DoubleClick, now absorbed into Epsilon). The relative performance of these two solutions demonstrates why you should research prospective email platforms thoroughly: Travel.com.au’s online marketing efforts are severely hampered by DARTmail’s extremely poor reputation and deliverability.
Let’s drill into just what “Sender Score” is and how we define “Deliverability”.
Sender Score is a proprietary ranking system developed by ReturnPath, the leader in email deliverability intelligence. Essentially it combines all ReturnPath’s deliverability and reputation data into a single index, thus providing a simple way to compare server performance.
“Deliverability” is simply the proportion of emails sent by a server that make it through to their destination. A low deliverability score means a server is sending messages to lots of invalid email addresses, is being blacklisted by ISPs and email providers, or is sending messages with a high spam score.
Thus, while deliverability is the more immediate measure of your email performance, your Sender Score will impact your future results, as a Sender Score of 60 or below means your reputation is so bad, many ISPs will block or defer your messages. This is a problem, because once you’re on a blacklist, it’s very, very hard to get off it, and often your only option is to start sending from a different IP (hopefully after cleaning your list of invalid addresses, and in extreme cases even performing a full list verification).
If you’d like a detailed analysis of your email marketing platform, simply send me a note. The contact details are all over the blog.
If you’d like to check your email provider’s Sender Score, use this resource. And if you need help with any of this, simply drop me a note.