OS X Automator send mail
you can directly do an applescript to send an email and call it from automator:

   tell application "Mail"
      activate
      set newMessage to make new outgoing message with properties {account:"Account Detail", subject:"Mail Subject", content:"Content"}
      tell newMessage  
        make new to recipient at end of to recipients with properties {address:theRecipient}
        set visible to true
      end tell
      send newMessage
    end tell


You would just need to get theRecipient from the input passed to the AppleScript action. Also, you need to replace the properties on the third line with details of your Mail account.

set theRecipient to (item 1 of input)


should do it.