Those who claim to divine the exact meaning of every little squiggle (e.g., that a certain shape of certain tail on a certain letter shows the writer to be jealous and acquisitive) are hoaxsters and nothing better than astrologers.
I agree. I also studied handwriting analysis a few years ago, just for fun. I found that most handwriting I analyzed (even writing of people I didn't know) were pretty accurate. But that was real handwriting, not printed block letters. I don't see how anyone could get a true analysis from block letters printed on an envelope. The writer obviously tried to disguise their handwriting. One thing I did notice though, is the downhill slant of the lines. If I remember right that indicates depression or discouragement. Also, the varying slant of the letters may indicate emotional confusion. Just the opinion of an amateur ;-)