If you want to send emails automatically from your SendGrid account to your Infusionsoft contacts, you can do that using Zapier.
You will need:
To connect your Infusionsoft to Zapier you will need an active Infusionsoft account. To get started with Infusionsoft, go here. You can learn more about getting started with Infusionsoft on Zapier, here.
To connect your Infusionsoft account to SendGrid, you must have an active SendGrid account. To learn more about getting started with SendGrid basics, start here. For more information about getting started with SendGrid on Zapier, go here.
Click here to Send emails from SendGrid to tagged Infusionsoft Contacts.
Now test the Zap to make sure it works. Once you’re satisfied with the results, tagged contacts in Infusionsoft will automatically receive emails via SendGrid.
If you ever want to change this Infusionsoft and SendGrid integration, just go to your Zapier dashboard and tweak anything you'd like.