static IRestResponse SendSimpleMessage ( string tittle , string message )
        {
            RestClient client = new RestClient( );
            client.BaseUrl = new Uri( "https://api.mailgun.net/v3" );
            client.Authenticator =
            new HttpBasicAuthenticator( "api" ,
            "key-b2858d64ab8c040d201b88741ff0a4##" );
            RestRequest request = new RestRequest( );
            request.AddParameter( "domain" ,
            "sandbox12c17ed9edb145ac8f1c361b88d55d##.mailgun.org" , ParameterType.UrlSegment );
            request.Resource = "{domain}/messages";
            request.AddParameter( "from" , "Admin##" );
            request.AddParameter( "to" , "mail1#####@gmail.com" );
            request.AddParameter( "to" , "mail2#####@list.ru" );
            request.AddParameter( "subject" , tittle );
            request.AddParameter( "text" , message );
            request.Method = Method.POST;
            return client.Execute( request );
        }