hardcopy

First, the use of a single word is not correct. It should be "hard copy," not "hardcopy."

Yes, you can use it that way, it's a common enough usage. Some people might write "hard copies," and this would be especially true if they are getting different content in the messages for which they are insisting on a hard copy. What you have written is not wrong, other than that you should not make a single word of hard copy.

-To everyone I told that I wouldn't need a hard copy, please disregard that message. I now need hard copies from everyone.

S. above notwithstanding, WB, it's a trend, at least here in the US, to push words together

https://www.google.ca/#q=hardcopy
https://www.google.ca/#q=trend+compounding+words

Contrary to an (my) earlier message I now need hardcopy from everyone

THank you~