A letter with your return address would be nearly the same as using a credit card. ~~Same thing with vouchers. Amazon can track that shit.~~ If privacy is truly your main concern then NO return address and nothing other than the $ and a slip of paper with your account #. You run the risk of getting your funds "lost" in the mail etc. etc. but you gain complete anonymity this way.
If you're just thinking about trying it out, I don't see a reason not to slap 1 month on your credit card and take her for a spin. If you discover that you like it, and truly want to be anonymous. Then follow the mailing steps above.
I've used Mullvad for years without issue (and no I don't care about port forwarding). +1 from me.
Edit: I've been made aware that the "vouchers" on Amazon are indeed legit and are produced/sealed by Mullvad. Might be a nice way to save a few bucks!
Woah, okay. I did not see that Mullvad posted a blog about it. Thanks for sharing, it actually cleared some questions up for me. I only saw the vouchers on Amazon randomly and didn't do any further research as I already have my subscription paid up.
I'm gonna be honest, my tinfoil hat still doesn't like the idea of Amazon having possession of my Mullvad account # (scratch code or not) or knowing that I even use Mullvad... but to each their own!