Très intéressant: je retiens surtout l'astuce du + dans l'adresse email.
«Let's say Bob's emails address is email@example.com. A sub-address uses a + to add a label like firstname.lastname@example.org. If Bob were to sign up to a site with the latter he would still get the messages as normal to email@example.com but now you (or rather, he) can create filters or simply switch off one of the sub-addresses altogether.
One more interesting tidbit is if you use unique sub-addresses for each of the sites you sign up to you will be able to see when someone, or rather who, sells your email to someone else... Busted!»