PowerShell Azure Function SendGrid Output Binding example. Associated Blogpost https://blog.darrenjrobinson.com/using-the-azure-functions-sendgrid-output-binding-with-powershell/

run.ps1

using namespace System.Net

# Input bindings are passed in via param block.
param($Request, $TriggerMetadata)

# Write to the Azure Functions log stream.
Write-Host "PowerShell HTTP trigger function processed a request."

$inputData = $Request.Body | convertfrom-json
$emailSubject = $inputData.subject
$emailBody = $inputData.messageContent 

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

Push-OutputBinding -Name message -Value (ConvertTo-Json -InputObject $mail -Depth 4)

# Associate values to output bindings by calling 'Push-OutputBinding'.
Push-OutputBinding -Name Response -Value ([HttpResponseContext]@{
    StatusCode = [HttpStatusCode]::OK
    Body = $mail
})