I doubt if Tortoise-SVN has any inbuilt feature to send Email-Notification as and when Developers keeps committing their code.
I personally do not prefer to have Email-Notification whenever any developer commits code to SVN. Instead you may have a look at concept of "
Continuous Integration". In this automated build process is scheduled which keeps checking if their is any Error in the Checked-In/Committed code.
http://www.martinfowler.com/articles/continuousIntegration.html
You may have a look at "
CruiseControl.NET" which provides Email-Notification feature.
CruiseControl.NET : Email Publisher
Below link has a information on integration of "CruiseControl.NET" with "SVN".
CruiseControl.NET : Subversion Source Control Block