It is technically possible for a person to click a link in an email without opening it. An Open Email event is only logged when a single pixel tracking image is downloaded from the Marketo server, but many email clients, such as Outlook, don't download images by default. So someone could open the email, read and click it without choosing to download the images, resulting in a Click Email without a corresponding Open.
Email performance reports have an additional logic in them that backfills the Opens. They know that to click an email you must open it. Smart Lists don't have this backfill, so the Opens in a Smart List will often be different than the Opens in a report.
I'm willing to bet this email went to a spam trap. Read my post to understand more:
Email Opens are typically tracked by an invisible GIF placed on the email by Marketo. If that gif is downloaded, Marketo knows the email was opened. If you send an email to a spam trap, the email is never opened by an actual person. Instead, a program will scan all of the links and click them, but a corresponding webpage visit never happens because the program immediately abandons the connection when it realizes its being redirected.
With a list of 12,000+ people it's highly possible that either a SPAM tram or a corporate spam filter is all over your emails. If this list was generated from a rental or a trade show I'll put $5 right now that you have numerous spam traps.
Read my blog post to see how to identify them and then you need to remove them from your database.
Spam filters will click alot on emails. I think Barracuda is a big offender here for marketers' data sanity.
There are tons of threads on these topics related to
- Spam/Bot clickers and openers
- Differences between Smart List filters and the Email Insight or Email Perf reports. Please do a search as they are informative.
Diane Schmid wrote:
However, when I run a smart list using the opened email filter, I get a lead count of 3,190. So is the 3,190 the unique opens where the 3,238 is the total opens? And if so, is there an easier way to arrive at the unique opens besides running a smart list?
BTW, Opens is Total Opens, if I open it twice it counts as 2.
Using an Email Send program will show you a dashboard of Delivered vs Sent and Opens but that doesn't give you Uniques.
There really are no "Easier" ways. You could set up your Email channel with Opened as a Success Metric and then, then create a smart campaign triggered on Email Is Opened with a flow step of Set Program Status, but is that really saving you any time?
The Smart List is pretty simple, I can't think of too many easier ways to get Unique opens.