Free and good .NET component to parse email file?

I've read Are there .NET Framework methods to parse an email (MIME)? , but since that question is quite old, I'd like to re-ask it:

Do you know of a good (in terms of performance and/or features and/or ease-of-use) and preferably gratis .NET Component that can parse an email message file?开发者_如何学编程

What I really need from the component actually is very simple: I need a way to manipulate (read/write/create) header fields.

However, additional functionalities will also be welcome.

One additional limitation: If the component is in the form of Source Code, it must be in VB.Net.