Rebex EWS

using (var client = new Rebex.Net.Ews())
{
  // connect and login
  client.Connect(hostname, SslMode.Implicit);
  client.Login(username, password);

  // get all messages in the Inbox folder and show them
  var list = client.GetMessageList(EwsFolderId.Inbox);

  foreach (EwsMessageInfo messageInfo in list)
  {
    Console.WriteLine(messageInfo.Subject);
  }
}     

.NET library for accessing Microsoft Exchange servers using Exchange Web Services (EWS). Makes it possible to send, receive, list and search e-mail messages. Supports TLS 1.3/1.2 and S/MIME.

Also includes SMTP library for sending e-mails using SMTP servers.