What you could do is use the BCC option, and attach everybody's email to that. Then you can send out one email, and the email addresses wouldn't be exposed. However, with that said, if you're wanting to write a personal email to each individual user, such as changing their name, then unfortunately that's not possible with the BCC option. It would send the same email to everybody.

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The man who comes back through the Door in the Wall will never be quite the same as the man who went out.