How do I send email alerts to users through either a web site or SQL?

I have build a C# web site using visual studio 2008. I am using an asp.net 3.5 listview control on my frontend to display data from my SQL Server 2005 backend database. I am using both linq and sql datasources throughout my web site. I have recently built a page within my web site containing a ReportViewer control bound to an objectdatasource to display reports to my users depending on filters they set through drop down list and textbox controls on the pages frontend. What I now need to do is some how send email alerts to my users when certain dates are approching (say one month before) within my backend database. What would be the best way to achieve this functionality? SQL Mail? Some sort of web based asp.net mail control?

Any help would be appreciated.