能否增加一个针对已下载的某个邮件“重新下载”的功能，目前我经常遇到客户端下载的邮件附件pdf打不开，但在web邮箱界面是没问题的，当我删除目前客户端邮件配置，重新下载，似乎那个pdf又下载成功了。

Can you add a 're download 'function for a downloaded email? Currently, I often encounter difficulties in opening the PDF attachment of emails downloaded by the client, but there is no problem on the web email interface. When I delete the current client email configuration and re config and re download, it seems that the PDF has been successfully downloaded again.