Hi,
the issue with the Apple Mail users is well-known "feature" of Apply email client
I am sorry, but there is really nothing that can be done to override this
Here is an article I found which talks about this feature
https://www.litmus.com/blog/apple-mail-privacy-protection-for-marketers/
We can't programmatically change this mail client behavior because, as you can read from that article, if the option is turned on, the email client will load email using some proxy servers which will remove all the tracking images and other codes from it
I know that, for example, in Outlook, you can add senders to the white list, which will allow Outlook to load images for such senders anyway. Maybe something like this exists in mac email client
Thank you for understanding!
Regards