public void Delete_Message() { var message = MailMessageBuilder.To(MailAddress) .WithSubject($"PSC GmailClient Test for Delete {DateTime.Now}").Build(); _client.Send(message); Thread.Sleep(WaitForMessageSentTimeout); var messagesSent = _client.GetMessages(new SubjectFilter(message.Subject)); _client.Delete(messagesSent.First()); _client.GetMessages(new SubjectFilter(message.Subject)).Should().BeEmpty(); }