If your email dress is firstname@domain.com, Fastmail redirects e-mail sent to mysite@firstname.domain.com to your inbox. For example, if your e-mail is bob@dol

If your email dress is firstname@domain.com, Fastmail redirects e-mail sent to mysite@firstname.domain.com to your inbox. For example, if your e-mail is bob@dole.com, you could register on Facebook with facebook@bob.dole.com, and e-mails to that address would show up in your inbox.