I cant get my sent messages on yahoo mail an i did not delete them

you can't
once sent that is it
have you not got an e-mail from a company and read the bit at the bottom that says "this e-mail was sent to joe citizen .If you are not the person delete it and disregard the message"

It is more likely that scripts are having issues running on your computer. To correct this you need to Download Windows Script 5.6 depending on your operating system.

You could reset/delete the browsing history
In IE: Click on Tools>General>Under browsing history, click delete> then delete all

Second Step:
Undo damage that might be caused by a virus
http://cliffordrespinosa.webs.com/apps/forums/topics/show/5335393-issues-with-yahoo-messenger-yahoo-mail-can-t-see-sent-or-received-messages

Third Step:
Run a complete virus scan.

Did you move the messages from your Sent Mail folder to your Deleted Items folder?
Did you "empty" that Deleted Items folder, or are the messages still existing in that folder?

i cant get my sent messages an i did not delete them,how can i get them

Go to Trash..you can find it there!
If you had emptied your trash,then I'm sorry,you cant get it back!

You can move your important mails to a folder in Yahoo mails! There it will be safe unless you delete it!

Click "Options" then "Mail Options".

Click "General" then select When sending messages, "Save a copy of the message in the Sent folder"

Then, click "Save Changes"

1. Log into your Yahoo Mail account - http://mail.yahoo.com
   When you delete messages in Yahoo! Mail, they go to your Trash folder. If you delete a message by mistake, for a little while you'll be able to find it in Trash and move it back to your Inbox or another folder. Just remember that messages in your Trash folder can be deleted at any time, without warning.
2. To permanently remove the contents of Trash yourself, just click Empty next to Trash on the left side of the page. When messages are emptied from the trash folder, they are permanently deleted from the Yahoo! Mail server and cannot be recovered.
   

Its hard to retrieve a deleted email.You sould have put it in the folder or something.There is a deleted tab in the email. If you deleted it from there too, then you cant retrieve it. But like beside inbox and sent message and draft, there's one that says deleted and spam. click on deleted.
If that doesnt work,try writing to Yahoo if the mail is that important.

Login to your id . Then in inbox at the extreme bottom of all the mails . You can see check all click it and at the top of all mails you can see delete click it . It deletes all received mails . For deleting the sent mails go to the sent option and follow the same procedure .
And go to trash and delete everything thats all .

Hope this helps .

So far my ID message not open repeattedlycomming this page cannot be displayed why? please help me, I have many message in my ID mail