Writing to a file has nothing to do with Flask. You can learn how to read/write to files here.
Keep in mind writing a large amount of data is slow, and will slow down the request.
if request.method == 'POST' and inputed_email:
# open is a built-in function, w is for write-mode (default is read)
with open('workfile', 'w') as f:
f.write(inputed_email)
return render_template(....)
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