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I feel like a very simple and relatively cheap security solution would be to make hotel room keys smart cards and just attach a smart card reader to the tablet/phone device being used to control the room. Add in the fact that hotels can say that smart cards are more expensive than the standard...
Not sure if Gmail changed their settings help page after learning of this, but the help makes specific mention of this issue.
"In some cases, senders may be able to know whether an individual has opened a message with unique image links. As always, Gmail scans every message for suspicious...