SmartMail on Azure VM - SmarterTools

This is a bit of a dumb question, I should know the answer but dearnt remove it on a live system.....

I know that running a bespoke website on Azure requires me to add SendGrid as an Azure resource, and this resource handles authentication etc to SendGrid.

But if I run SM in a VM on Azure, do I need the SendGrid resource? SM has the SendGrid connection credentials, so the Azure SendGrid resource in this case is redundent isnt it?

I added the SendGrid resouce to Azure purley out of habbit from when I had written sites from scratch.