umm, not sure where i got it from now.
I found a zip folder called pop3.zip and it had the whole Indy.Socket stuff and all of it programmed in C# code with those two DLL files.

I can't figure out where I got it from.

I just uploaded it to my webserver if you wanna download what I had found:
http://www.serysoft.com/files/pop3.zip