I can assure you from my end, Moderators don't have access to anyone's site mail but our own.  The only way I could read something you wrote would be:

1. if you wrote to me.
2. if someone you wrote to forwarded it to me.

And, since Moderators have more access to site functions, it stands to reason that Coordinators do not have access to your site mail, either.

That would leave the handful of admins.  Who, while I've never watched over their shoulder while they worked (let alone met face to face), are very trustworthy people, and also don't have enough time in their day to go through anyone's site mail willy-nilly ;)

Jeni

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.