private static void SendMail(IMailSender mailSender, MailSettings credentialSettings) { MailInfo mailInfo = new MailInfo() { From = "Muhammet Kaya", Body = "This is test body.", Subject = "This Test Mail", IsBodyHtml = false, IsDeliveryReceiptRequest = true, IsReadReceiptRequest = true, ToRecipients = new string[] { "*****@*****.**" } }; //Client is initializing mailSender.InitializeClient(credentialSettings); //Mail is sending mailSender.SendMail(mailInfo); }