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How does sender know I do not use HTML when "Allow remote content" is off

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I get dozens of emails stating, "It looks like you're using plain-text email" or something to that effect. I see this message when I merely highlight the email in the list but without opening the email by clicking on the list entry. "Allow remote content" is set to off.

How do they know?

Thanks.

I get dozens of emails stating, "It looks like you're using plain-text email" or something to that effect. I see this message when I merely highlight the email in the list but without opening the email by clicking on the list entry. "Allow remote content" is set to off. How do they know? Thanks.

Chosen solution

I think that is generated by javascript that is embedded into the message. It is not a message being inserted in real time (although it does appear that way).

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Chosen Solution

I think that is generated by javascript that is embedded into the message. It is not a message being inserted in real time (although it does appear that way).

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Thank you David. Security and Privacy are an illusion.