> Adding a point for corrupted images is sounding better and better.

I disagree. To check out what happens I converted a JPG picture into a GIF
file
and sent it to myself. One time I converted it with IrfanView and the second 
time with PaintShop Pro. Both GIF files had the result
"giftopnm: EOF or error reading data portion..." So I produced a corrupt (?)
image, but it was not spam.

I have no idea what is wrong and how it could be fixed. Only this: a GIF
file
seems to be divided into several blocks. Perhaps one block (perhaps the last
block) is too short and does not match to its block header (if any exists?).
Perhaps it is possible to read out the correct block length from a header
and fill the block with 00h to get a valid GIF file.

Ah... I just found that there is a program named GIFFIX. I should try it
out.

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