SendGrid Message Format from a PowerShell Azure Function. Associated Blogpost https://blog.darrenjrobinson.com/using-the-azure-functions-sendgrid-output-binding-with-powershell/

SendGrid Message Format from a PowerShell Azure Function.ps1

$mail = @{
    "personalizations" = @(
        @{
            "to" = @(
                @{
                    "email" = "$($env:sendGridToAddress)"
                }
            )
        }
    )
    "from"             = @{ 
        "email" = "$($env:sendGridFromAddress)"
    }        
    "subject"          = "$($emailSubject)"
    "content"          = @(
        @{
            "type"  = "text/plain"
            "value" = "$($emailBody)"
        }
    )
}