Entering the first few letters of your domain will display a suggestion. (e.g "@g" for "@gmail.com")
Click, or press tab-key to autocomplete your email domains.
(or tap on the suggestion for mobile users.)
输入邮箱的前几个字符（例如："@g"），会得到"@gmail.com"的自动提示，点击或按 tab 键 可以自动完成邮箱的填写。