Email is so old school. New trend is SMS. Send bulk SMS to your customer, This is sample .net code to send bulk SMS using DIDForSale SMS API

eb.config settings:
<add key="DidNumber" value="1XXXXXXXXXX" />
<add key="SmsApiBaseUrl" value="https://api.didforsale.com/didforsaleapi/index.php/api/SMS/send/" />
<add key="ApiKey" value="SMjKQ1v67K320e6af48fa9d99b4778132a11ae1d31" />
Coding Description: 
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Configuration;
using System.Web.Mvc;
using System.Net.Security;
using System.Security.Cryptography.X509Certificates;
namespace DidIVR.Controllers
    public class BulkSMSController : Controller
        // GET: BulkSMS
        public string didNumber = WebConfigurationManager.AppSettings["DidNumber"].ToString();
        public string apiKey = WebConfigurationManager.AppSettings["ApiKey"].ToString();
        public string smsApiBaseUrl = WebConfigurationManager.AppSettings["SmsApiBaseUrl"].ToString();
        public ActionResult Index()
            var values = System.IO.File.ReadAllLines(@"D:\Raman Saini\DidForSale\DidIVR\DidIVR\DidIVR\App_Data\MobileNumbers.csv").Skip(1).ToArray();
            var result = HttpPostRequest(values, "DIDforsale provide SIP, Voice sms and VoIP Solutions.");
            return this.Content(result);
        public string HttpPostRequest(string[] mobileNumber, string text)
            string result = string.Empty;
            //DIDforsale api only accept json data format
            var httpWebRequest = (HttpWebRequest)WebRequest.Create(smsApiBaseUrl + apiKey);
            httpWebRequest.ContentType = "application/json";
            httpWebRequest.Method = "POST";
            using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
                var json = "{\"from\":\"" + didNumber + "\",\"to\":" + JsonConvert.SerializeObject(mobileNumber) + ",\"text\":\"" + text + "\"}";
            ServicePointManager.ServerCertificateValidationCallback = delegate (object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) { return true; };
            ServicePointManager.SecurityProtocol = SecurityProtocolType.Ssl3 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
            var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
            using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
                result = streamReader.ReadToEnd();
            return result;

PS: Sending SMS can be illegal in some states. Its important that you have consent from customer that they want to receive SMS from your company.

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