This is a pretty simple SQL CLR procedure that will allow you to send email from SQL Express instances.  

To install:
1.  Build it, put it somewhere on your server that you can easily get to.
2.  Run the open the install.sql script in SSMS (make sure to change the necessary values for your environment).
3.  See example.sql for an example of how to call the procedure.

Note:
1.  If you want to send to multiple recipients delimit each recipient with a semi-colon.
2.  If you want to attach multiple files delimit each file path with a semi-colon.