You could use Nant to send email, but TeamCity is more appropriate, as it can provide a centralized place for notifications, including emails.
TeamCity provides a wide range of notification possibilities to keep developers informed about the status of their projects.
Notifications can be sent by:
- e-mail,
- Jabber/XMPP instant messages or
- can be displayed in the IDE (with the help of TeamCity plugins) or
- the Windows system tray (using TeamCity Windows tray notifier).
Each user can select the events to receive notifications for on My Settings And Tools page. The notification messages can be customized globally on per-server basis.
So it is not just about how to send the mail, but also how to manage the notification process, from the server and from the client perspective.