Lately, Gmail users have been facing a new issue in their inboxes.
You might have noticed popups saying things like, “Images in this message are hidden. This message might be suspicious or spam.” And even more concerning, there’s now a big “Report spam” button that makes it easy for people to mark emails as unwanted.
So, what’s going on?
The initial concern is something known as an “open tracking pixel.” This is a tiny, invisible image (just 1×1 pixel) attached to emails sent through cold outreach or email tracking tools. When the email is opened, the pixel loads and signals that the message has been viewed.
But that’s not all.
It turns out that the issue isn’t just about open tracking pixels. Regular images in emails can also trigger the same warning messages or cause emails to be marked as suspicious. However, it’s important to note that having open tracking or images in an email doesn’t guarantee that the email will always be flagged—sometimes they are, sometimes they aren’t.
At Reply.io, we’ve been researching this issue closely.
We conducted a study by sending emails with open tracking or images to newly created Gmail accounts, as well as accounts with an established history. Our findings confirmed that both open tracking and images can, at times, cause emails to be marked as suspicious. Interestingly, we observed that paid GSuite accounts are more likely to flag such emails as spam, especially when open tracking or images are involved. However, this doesn’t happen in 100% of cases.
To summarize, open tracking pixels or pictures in emails can increase the risk of being flagged as suspicious or sent to spam, but it’s not a guaranteed outcome. The issue is more complex and depends on various factors, such as the type of Gmail account and email history.
What you can do now
If you want to make sure your emails keep reaching the right people and don’t get flagged as suspicious, here are some possible actions to consider. These recommendations are not sequential steps, but rather options that you can choose from based on your specific needs.