Apple's new Mail Privacy Protection caches external content when a user has this feature enabled and is using the Apple Mail app
To prevent this from happening with the Deadline Funnel email timer if you are adding the Email Timer to multiple emails in your campaign, it is essential that you copy a fresh code for each email that you’re adding it to.
Each time you copy the code, Deadline Funnel generates a new, slightly different code. So, for example, if you are using the timer in two different emails, you would click to copy the code and add it to the first email, then come back to Deadline Funnel, click to copy the code a second time, and paste that new code into your second email.
Here are some resources with more details about how Apple Mail Privacy Protection works:
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