This is a easy and sometime quiet painful smtp client made in .NET (made damn easy smtp class FTW! ) that lets you send email using a SMTP server. Just config it with your SMTP account settings and it lets you send mails even HTML mails with images embedded as attachements. The HTML part was done in haste and will occasionally show you error messages, but then you can curse me for doing that. otherwise it comes pretty useful when you have to do mass mailing (a.k.a spamming) other folks of your organization. Further, it can pick up name and email IDs from a CSV too.
[Caution: Just be careful what you are about to post, better demo run things by CC-ing to yourself before going for actual mass mail run]
Source Code: Download
of course, you can get better tool somewhere or service like GMail are already great for that.