If your email provider supports it, Customize From Address allows you to make a one-off minor alteration to your From address without having to create a new identity in Account Settings. For example, if your From address is John Doe <john@example.com> you may want to change it to John Doe <john+doe@example.com> or John <john@example.com>.
如果您的电子邮件提供商支持，自定义发件人地址允许修改您的发件人地址而无需在账户设置中创建一个新的身份。例如，如果您发件人地址是李四 <john@example.com>，你可能想要将其更改为李四 <john+doe@example.com> 或约翰 <john@example.com>。