The title of your post says "Read from SMTP Server" while the body references to POP3 Server.
But i guess you meant POP3 Server. You can check out my open source C# component at http://sourceforge.net/projects/hpop/
. Try to download the first release (as it is simplest, current release is quite bloated). You can check the code and convert to VB
.NET. I think it would be quite simple to do the conversion.
And do visit "http://www.faqs.org/rfcs/rfc1939.html" for a reference to POP3 protocol.