Currently there are a number of companies offering a service to embed zero pixel gifs in your outgoing emails, which make calls to specific servers with specific file locations that are stored in a database attached to the name of the recipient and details of the message. When the recipient opens the email with the embedded gif, it makes a request to earlier mentioned server, which exposes the user agent, location, and IP, of the person reading the message. It also tells the sender that the message was open, when it was opened, how many times, and from where.
The Internet is built on surveillance.
Proton blocks all that, I believe. It looks like it does, anyway. I get a lot of emails that are literally blank boxes because companies use some third party for mass emails.
Yes, good clients will not load images until you knowingly direct them to. Proton is on the list of clients/services that adhere to this practice.
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