The invisible MID should be made visible and put after "Post a reply to 
this message".

"Reply" is AFAIK for email, it should rather be "Followup".

The signature separator (right word?) "-- " isn't displayed.

The signature is quoted.

There should be a blank after the quoting-">" IMO.

There's always one more blank line at the end quoted.

The server converts a &#xxx; to a single character in plain-text messages.

Nevertheless: Great work!
-- 
light_source{0#macro L(K,H,W)sphere{H.5}sphere{K.5}sphere{W.5}cylinder{
H,K.5}cylinder{H,W.5}#end 3}union{L(0v*-2<2,-2>)L(y*-3z-v*5z*3-y)L(-y*3
0u*3)L(y*-3v*-5-z,z*-3-y)rotate-v*clock pigment{rgb.5}translate<0,2,9>}
// +KFF200 +KF720 +W120 +H90 -F -A -GA -P

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