Aliasing and forwarding is not a good solution if you are concerned about law enforcement, because your personal e-mail is still linked with the tracker, just behind an extra hop and in addition you allow someone in between to read your e-mails. You had the answer yourself. Create a completely fresh free e-mail account somewhere, using as minimum a private tab to prevent tracking data to link anything to the account… and if you can get a free e-mail account with IMAP/POP access so that you can use it in an e-mail client to leak less data, do that.