Accidentally I removed few emails with Pop3Client from email
I use OpenPop for .net email parsing
In the mail client deleted emails disappeared
Trash is empty, synchronise with server nothing change.
Any proposal how I can to restore this emails?
The POP3 protocol does not handle deleted emails in any way. You need to look at your email provider, and see if you can restore your email from there somehow.
If the provider does not provide a way to restore the email, and you cannot get it in any other way, I guess the email is lost.