Asp.Net/C# WebPage not sending emails.

Hi,
we develop using Visual Studio 2013.
A client has requested us to develop a webpage that has to send emails from our network to ouside clients. We have not been able to send emails yet. We think the issue is that our client uses Office365 in the cloud for their email accounts.

Our code is the following:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Mail;
using System.Web;

namespace SGTagler.Controller
{
    public class envio_email
    {
        /* Cliente SMTP
         * Gmail:  smtp.gmail.com  puerto:587
         * Hotmail: smtp.live.com  puerto:25
         */

        SmtpClient server = new SmtpClient("smtp.office365.com", 587);

        public envio_email()
        {
            /* Autenticacion en el Servidor
             * Utilizaremos nuestra cuenta de correo
             *
             * Direccion de Correo (Gmail o Hotmail)
             * y Contrasena correspondiente
             */

            server.Credentials = new System.Net.NetworkCredential("asesoriainformatica1@tagler.cl", "1xxxx4"); 
  

            //Habilitar o deshabilitar conexion segura
            server.EnableSsl = true;
        }
 
        public void MandarCorreo(MailMessage mensaje)
        {
            server.Send(mensaje);
        }

    }

}

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