Check whether if a particular email has not been replied in Microsoft graph API

Question

Hi folks;
I am working on a problem in which I could find out that if a particular email or conversion has been replied using Microsoft graph API. I have tried different logics like create time, sent time, received time but none worked for me. Please guide, your help would be highly appreciated.

Answer 1

There are a number of ways to do that, if you want to find the response to a message the easiest way should be to take the InternetMessageId from the original email in the Inbox eg

GraphServiceClient graphServiceClient = new GraphServiceClient(credentials);  
  
var Messages = graphServiceClient.Users["user@domain.com"].MailFolders["Inbox"].Messages.Request().Select("Subject,InternetMessageId").Top(1).GetAsync().GetAwaiter().GetResult();  
Console.WriteLine(Messages[0].InternetMessageId);  

and then you can search for any messages in the SentItems folder that are In-Reply-to that message using the In-Reply-To headers extended property

    String filterval = $"singleValueExtendedProperties/Any(ep: ep/id eq 'String 0x1042' and ep/value eq '{Messages[0].InternetMessageId}')";  
      
      
    var Replies = graphServiceClient.Users["gscales@datarumble.com"].MailFolders["SentItems"].Messages.Request()  
        .Filter(filterval).GetAsync().GetAwaiter().GetResult();  
      
    Console.WriteLine(Replies.Count);  

Another approach can be to use the LastVerbExecuted extended property https://learn.microsoft.com/en-us/answers/questions/373854/identify-forward-and-reply-emails-using-graph-api.html