This is a little embarrassing for me to ask, because years ago I set this up multiple times, however, I've been out of the CiviCRM world since 2012, and can't, for the life of me, figure out how to configure a CiviCRM 4.6 to send via sendgrid for an organization I volunteer with. I have a sendgrid account, I have CiviCRM 4.6.11 configured with wordpress.
Is there a special module/extension/plugin? custom script or code?