Passing email content into an Azure Function App - azure

Question

I want to pass the contents of an email into my Function App in order to remove HTML.
I'm following this tutorial but I'm puzzled at how the incoming email is passed in. I know that it is a http request but not sure which line is dealing with this email that we can then do work on.
We have our req which is our http request so I'm guessing that once we create the trigger in Azure, req is passed straight in?
This the example code that is provided:
#r "Newtonsoft.Json"
using System.Net;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Primitives;
using Newtonsoft.Json;
using System.Text.RegularExpressions;
public static async Task<IActionResult> Run(HttpRequest req, ILogger log) {
log.LogInformation("HttpWebhook triggered");
// Parse query parameter
string emailBodyContent = await new StreamReader(req.Body).ReadToEndAsync();
// Replace HTML with other characters
string updatedBody = Regex.Replace(emailBodyContent, "<.*?>", string.Empty);
updatedBody = updatedBody.Replace("\\r\\n", " ");
updatedBody = updatedBody.Replace(#" ", " ");
// Return cleaned text
return (ActionResult)new OkObjectResult(new { updatedBody });
}

Answer 1

req.Body is the body of your HTTP message when you send a POST request to your Function. So the body of your request should contain your entire email content, then you should be good to go.
Actually your comment // Parse query parameter is wrong. It is not parsing a query parameter but reading the HTTP message body.
btw: I would advise you to do yourself a favor and not write C# Script Functions in the Azure Portal but write and test them locally, e.g. in VS Code, then compile them and deploy them properly to Azure Functions.