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Email assigned to this account has nothing to do with the email from which I will be sending to police.
So, has anyone a good answer to my question?
My main consern here is this: is it possible to track my real IP even if I use ProtonVPN (free version) ?

Hi. I would like to send an anonymouse e-mail to police. I created a special Protonmail account for this. However I am not sure if they can track me somehow. Is it enough that I use free ProtonVPN to hide my IP? I would do this from the place where I live as there is the damn coronavirus quarantine in my country.

Thanks.