I need to recover deleted emails

When you delete mail, depending on how you configured the account when you set it up on the iPhone, it will either go to the Trash folder, or the Archive folder. If you have the Trash folder set to delete after a certain amount of time, then they will get permanently deleted.

Check your trash folder.

Is their any way i could recover deleted mail

As I indicated, deleted mail is sent to Trash. If you deleted it from Trash, then it is gone.