Below is an example of .Net core 3.1 Console App that is reading a mailbox on Exchange and checking the count of mails. If the mail count cross a certain threshold, it’ll check for an e-mail older than 2 hours to send an alert.

Such an example can be used to schedule alerts or log information if you’re tracking mails in a mailbox.

Install Nuget package Microsoft.Exchange.WebServices to use ExchangeService class.

using Microsoft.Exchange.WebServices.Data;

public static void Main(string[] args)
{
	string TextlogMessage;
	string Subject = "";
	string sUsername = ConfigurationManager.AppSettings.Get("UserName");
	var section = ConfigurationManager.GetSection("secureAppSettings") as NameValueCollection;
	string vCount = ConfigurationManager.AppSettings.Get("Count");
	int Count = Convert.ToInt32(vCount);
	string sPassword = ConfigurationManager.AppSettings.Get("Password");
	
	string sDomain = ConfigurationManager.AppSettings.Get("Domain");
	TimeZoneInfo INDIAN_ZONE = TimeZoneInfo.FindSystemTimeZoneById("India Standard Time");
	DateTime indianTime = TimeZoneInfo.ConvertTimeFromUtc(DateTime.UtcNow, INDIAN_ZONE);
	DateTime comparedate = indianTime.AddHours(-2);
	DateTime MailDateTime = comparedate;
	ExchangeService exchange = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
	exchange.Credentials = new WebCredentials(sUsername, sPassword, sDomain);
	
	exchange.Url = new Uri(ConfigurationManager.AppSettings.Get("ExchangeUrl"));
	Folder inbox = Folder.Bind(exchange, WellKnownFolderName.Inbox);
	var oSendemail = 0;
	TextlogMessage = "Start With count:" + inbox.TotalCount;




	if (inbox.TotalCount > Count)
	{

		Console.WriteLine("Count " + inbox.TotalCount);

		ItemView view = new ItemView(1);

		view.OrderBy.Add(ItemSchema.DateTimeReceived, SortDirection.Ascending);
		
		var findResults = exchange.FindItems(WellKnownFolderName.Inbox, view);


		foreach (Item item in findResults.Items)
		{

			Console.WriteLine("Test: " + item.DateTimeReceived + " %" + comparedate);
			DateTime newdate = TimeZoneInfo.ConvertTimeToUtc(item.DateTimeReceived);

			int Dresult = DateTime.Compare(newdate, comparedate);
			if (Dresult < 0)
			{
				Console.WriteLine("Alert " + "Sub" + item.Subject + newdate + " %" + comparedate);
				oSendemail = 1;
				MailDateTime = newdate;
				Subject = item.Subject;


			}

		}
		if (oSendemail > 0)
		{
			Program p = new Program();
			//To Do Send Email Logic..
			p.SendEmail(exchange, oSendemail, inbox.TotalCount, TextlogMessage);
			TextlogMessage = TextlogMessage + " EmailTime: " + MailDateTime + "CompareTime " + comparedate + "  Alert Sent Subject : " + Subject;

		}

	}

	//To Do logging..
	log(TextlogMessage);

}