We made the switch from “relay.firefox.com” to “mozmail.com” in order to make it possible to get a custom email subdomain, such as mask@yourdomain.mozmail.com. Custom email subdomains, available to { -brand-name-relay-premium } subscribers, allow you to generate easier-to-remember email masks.
之所以从“relay.firefox.com”切换到“mozmail.com”，是为了自定义邮箱子域名这一特性，如 mask@yourdomain.mozmail.com。{ -brand-name-relay-premium } 订阅者可使用自定义子域名生成更好记的马甲。