You are right, the FAQ is probably not right at this point, In fact, the box uses keys it knows about, and tries to get keys when receiving encrypted mail. But

You are right, the FAQ is probably not right at this point, In fact, the box uses keys it knows about, and tries to get keys when receiving encrypted mail. But of course you can send unencrypted email. (Otherwise you would have to use a specific email not only for contacts that don't use GnuPG, but also for registration with 99% of all the websites out there.)