Add disclaimer for tor usage with Thunderbird

Aggiunto disclaimer per usare Tor in maniera più consapevole.

src/docs/anon/tor.en.md

@@ -61,6 +61,19 @@ Configuring Thunderbird to send and receive email via Tor
 While this approach is not recommended by torproject, here we provide a few steps to use Tor to communicate with our mailservers.
 This might be a good option in situations where one is not able to access our mailservers directly (for example because of state censorship).
 
+**Disclaimer:** this guide does not explain how to send anonymous emails (for that see how to use our [anonymous remailer][ar]), nor these configurations
+enhance the anonymity of the messages you send. Connecting to our services through Tor is a way to obfuscate from the network provider you are
+using that you are connecting to our servers. This does not make you anonymous from us, because you have to authenticate to our servers to be
+able to use them, nor this shields you from information you could send through mail to your correspondents (i.e. in some mail header) that
+could identify you.
+If you have such needs, we suggest to either send the email via the webmail (via Tor, if you want to be anonymous in your navigation for your
+network provider) or to use [Tails][t], configuring your email account in [Thunderbird offered in that distribution][tt].
+
+[ar]: /docs/anon/remailer
+[t]: https://tails.boum.org/
+[tt]: https://tails.boum.org/doc/anonymous_internet/thunderbird/index.en.html
+
+
 #### **Prerequisite 1: having a running Tor instance on your computer**
 
 Tor is a program that exposes a local proxy to connect to the internet (and also to the network of hidden services). Tor Browser is a