How Do I Retrieve Mail Accidentally Deleted?

If using Yahoo!, they cannot be retrieved however if you are using an online venue for email services and they have the selection available in your options, features and/or control panel that will allow you to retrieve anything in your garbage can; then you can retrieve them from that particular email provider.  If you are using Microsoft Outlook for example, you can always go to your recycle bin and retrieve them immediately because the operating system normally holds up to about 30-40 deleted emails or messaging features used in the recycle bin when you first setup the computer for use. If all else fails, you can always try contacting your email service provider and explaining to them exactly what you did wrong when deleting your wanted email and they can either send you retrieval instructions or provide you with a resolution.