We want to use an excel file for a small survey (without developing a webpage
with a database behind).
Everything is fine including a small based on excel app to gather and
analyze info from all returned excel spreadsheets.
The problem is how to have responses anonymously. The approach were going
to implement is to send the excel template via e-mail to users and ask them
to send it back via e-mail as well. But, if they send it from a personal
e-mail it wont be anonymous.

Could anybody advise anything on it?

Thanks