I wrote, and posted, several handwritten first letters today, from this site and a couple of others. However, I just noticed your Point of Contact. If we "must" read something, then make us click on it before showing the complete address. That makes sense, my eyes glossed over that specific part before; it probably seemed like random nonsense.
It did, however, have useful tips. I would have written their full names, and, at least, the prisoner number on it. I did put my full name and address in the upper right hand corner as a general precaution.
And as a general rule of design, the eye does not naturally go toward dark on dark coloring. It looks more like a black hole, though not literally. I eventually noticed it, but after having letters in mailboxes.
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good post