https://blog.wongcw.com/2020/01/20/foxmail-v7-2-15-build-80-%e5%a4%9a%e8%aa%9e%e8%a8%80%e4%b8%ad%e6%96%87%e2%80%8b%e2%80%8b%e6%ad%a3%e5%bc%8f%e7%89%88-%e9%83%b5%e4%bb%b6%e6%94%b6%e7%99%bc%e5%ae%a2%e6%88%b6%e7%ab%af/