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Is there a recommended way to check if an email sent by an application was read by its recipient?
One way is to send an image in the html with some querystring parameters and handle that request, but the problem with this approach is that most of mail clients block images.
Can I do the same with stylesheets? or do stylesheets also get blocked by mail clients?
Is there any other way?
Thanks in advance.
You can use
read receipts, but (like embedded images) they can easily be turned off. So essentially, the answer is… you can’t, reliably.