A must read on engagement
I really can’t add anything to what Chad wrote in Opens, Clicks, And Blocks In The Third Age Of Email Deliverability
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Tor cleans up their lists
Recently I got an email from Tor. Apparently they’re watching their opens and clicks and they noticed I hadn’t loaded any images recently.
Read MoreFAQ about opens and Gmail caching
I had hoped to blog about something else today, but this still seems to be a big concern for a number of people. There are a lot of questions running around, some of which we don’t have answers to, others of which we have answers based on some evidence.
It’s important to remember that we’ve seen Gmail roll things out and then roll things back and do phased transitions during deployment. What various people are reporting about images and caching and headers are accurate at the time they are tested. But they may not be accurate tomorrow or in a week or in a month.
I’ve also discovered through this process that a lot of different providers use significantly different image tracking in order to record image loads. Some of these techniques seem to be more resistant to Google’s new image loading process than others.
Why is this all so important?
Image tracking has become a fundamental part of email marketing. It’s something that can be measured, and so a lot of marketers evaluate the effectiveness of an email send based partially on open rate.
How does open tracking work?
For open tracking, ESPs inject a uniquely tagged image into the email. When the recipient opens an email and has images on, the email client calls to the sender server and asks the sender server for all the images in the email. When the tagged image is returned to the recipient, the server records an “open.”
How does caching break open tracking?
Caching means that only the first load of an image is provided by the sender’s server. Subsequent loads of an image are served by the caching proxy. Caching proxies are nothing new; they just haven’t affected email enough in the past for us to have to talk about it.
Why are some people reporting zero problems?
The first load of a unique image always happens. Some folks don’t measure repeat opens, so they’re not even noticing any changes in their reporting thus are saying they’re seeing no problems.
What else is image tracking used for?
Image tracking can also be used for device detection by reading the “user-agent” string that each device returns. Gmail is currently rewriting the “user-agent” string thus breaking all device detection. The string is unique enough that it would be possible to tag those opens as “opened through gmail web interface.” Gmail may decide to pass through the user agent in the future, the HTTP standard does allow for that.
Image tracking can also be used for geolocation. Some senders use the location of an IP address to return images relevant to a user’s location. The accuracy of geolocation is totally dependent on the accuracy of the IP to location database used; it is a best guess of the user’s location. Gmail is currently not passing through the user’s IP address when requesting the original image. I don’t expect them to start, given they also don’t reveal user IPs when Gmail web users send mail. This falls in the same category of privacy protection.
Is there a workaround?
I have heard of a few people claiming they have a fix. The problem is all of the fixes I have seen involve doing things that violate the HTTP RFCs. For instance, the “fix” or “workaround” discussed at E-Mail Marketing Tipps is to not send back an image at all. This is working now to track repeat opens, but Gmail may adapt and block this as well. It’s also possible that Gmail may decide people trying to “work around” Gmail’s cache should be blocked outright for violating the HTTP spec.
Where can I find more information?
Other blog posts on the issue, including research on what people have seen.
Don't take my subscribers away!
Tom Sather has a good summary of the problems with inactive email addresses and why data hygiene is critical to maintain high deliverability. These recommendations are some of the most difficult to convince people to implement.
Some of my clients even show me numbers that show that a recipient that hadn’t opened or read and email in 18 months, suddenly made a multi-hundred dollar purchase. Another client had clear numbers that showed even recipients that didn’t open for an entire year were responsible for 10% of revenue.
They tell me I can’t expect them to let their customers go. These are significant amounts of money and they won’t let any potential revenue go without a fight.
I understand this, I really do. The bottom line numbers do make it tough to argue that inactive subscribers should be removed. Particularly when the best we can offer is vague statements about how delivery may be affected by sending mail to unengaged users.
I don’t think many senders realize that when they talk about unengaged users they are actually talking about two distinct groups of recipients.
The first group is that group of users that actively receive email, but who aren’t opening or reading emails from particular senders. This could be because of their personal filters, or because the mail is going to the bulk folder or even simply because they don’t load images by default. This is the pool that most senders think of when they’re arguing against removing unengaged users.
The second group is that group of users that never logs in ever. They have abandoned the email address and never check it. I wrote a series of posts on Zombie Emails (Part 1, 2, 3) last September, finishing with suggestions on how to fight zombie email addresses.
Unlike senders ISPs can trivially separate the abandoned accounts from the recipients who just don’t load images. Sending to a significant percentage of zombie accounts makes you look like a spammer. Not just because spammers send mail to really old address lists, but a number of spammers pad their lists with zombie accounts in order to hide their complaint rates. The ISPs caught onto this trick pretty quickly and also discovered this was a good metric to use as part of their filtering.
I know it’s difficult to face the end of any relationship. But an email subscription isn’t forever and if you try to make it forever then you may face delivery problems with your new subscribers.