I was able to achieve this by performing two separate scripts.This method assumes you have a working SMTP configuration on your FileMaker Server e.g you can send SMTP emails from server. A good way to test this is through the FileMaker Server admin console (General Settings > Email Notifications) then you can click Test SMTP Settings.
Script 1: Send Mail
Script 2: Perform Script on Server [wait for completion; "Send Mail"]
This came in really handy when using a deployment with FileMaker WebDirect users. Sending emails directly from our server was much better for us.
Hope this helps