Free, small, easy to use SMTP server?

Hi,

Hope this is right forum. Here comes stupid question :)

I want to send emails from my vb.net program. I installed program 'Free SMTP Server' (http://www.softstack.com/freesmtp.html ) and using that I can send my mails.

But I don't like this program very much. It's so big, it's must be always open/visible when I send my mail, I cannot even minimize it into windows system tray. So what I need is some - little, free and free to distribute with my program - smtp server. It would be also great if user cannot even see it.

So what I need is some good suggestions. What should I use?

If all you want to do is send email you don't need the overhead of a server - servers generally receive email in addition to being able to forward, etc.

This project works pretty well for sending email

http://vbforums.com/attachment.php?attachmentid=38907