碰碰运气。。。

https://help.yahoo.com/kb/recover-deleted-email-trash-folder-sln4849.html

https://www.techwalla.com/articles/recover-deleted-yahoo-email-messages

Yahoo现在是个没人疼爱的流浪儿。赶紧换一家吧，Google gmail, Microsoft outlook mail都很好，至少不会三天两头被黑。

https://www.wikihow.com/Switch-from-Yahoo!-Mail-to-Gmail

https://blogs.office.com/en-us/2014/04/16/outlook-com-customers-can-now-import-their-email-from-yahoo-mail/