I don't think this guy deserved to get his answer deleted as spam. Martin'Vobr vas Rebex linked to a product he makes as an example of a library to accomplish the task the OP sought, and did so in a way that made it clear that he is the creator of the library and therefore his word should be taken understanding that he is biased.
Do you think he did anything underhanded in his answer? Here's the "spammy" part, for those without ten thousand arbitrary numbers:
I would try the code from the codeproject and if it suits your needs stick with it. In case of too many parsing problem the commercial email component with decent support could be a wise move. I would recommend our Rebex Mail ($149 single dev) but I'm biased. Feel free to browse for you own favorite ;-). At least it will be (in case of any problem) someone who is paid for solving your mail parsing problem.
Ordinarily I would flag this for moderator attention but unfortunately I am not permitted to flag locked answers. Also, I'd like to know if I'm completely wrong about my understanding of what is and is not spam.
To me, this isn't spam. To six other people, it is. One of us has to be wrong, by the pigeonholing convention of '57. Can we figure this out? There are a lot of similar users to Martin who post their products, and a lot of them do it in a very spammy way. But in the specific instance of Martin I think he does it well. We can't outright outlaw all users who advocate their own libraries, can we? Those might be the only libraries that do what the asker wants, after all.